12
Límites y derivadas
1. Funciones especiales
PIENSA Y CALCULA Completa la tabla siguiente:
x
– 3,6
3,6
0,8
– 0,8
Ent(x) Dec(x) |x| Signo(x)
Solución: x
–3,6
3,6
0,8
–0,8
Ent(x)
–4
3
0
–1
Dec(x)
0,4
0,6
0,8
0,2
|x|
3,6
3,6
0,8
0,8
Signo(x)
–1
1
1
–1
APLICA LA TEORÍA 1
Representa las siguientes funciones: a) y = Ent(2x)
2
b) y = signo(x – 1)
Solución:
Representa las siguientes funciones: b) y = |– x2 + 4|
a) y = |x + 2| Solución:
a)
a)
Y
Y
y = Ent (2x) X
X
b)
b)
Y
Y
. L . S , o ñ u r B l a i r o t i d E o p u r G ©
y = signo (x – 1) X
366
X
SOLUCIONARIO
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Representa las siguientes funciones:
3
a) y = |log2 x|
Solución:
b) y = |sen x|
Y
Solución:
a)
X
Y y = |log2 x| X
5
b)
y=
y = |sen x|
1 Y π
0
/2
1
π
2
3
Representa la siguiente función:
4
3π/2 5
2π 6 X
{
1/x
si x < 0
3x – 2
si x Ó 0
Solución: Y
–1 X
Representa la siguiente función:
4
y=
{
x+4
si x Ì – 1
x2
si x > – 1
2. Límites
PIENSA Y CALCULA Completa la tabla y estima el valor al que tiende la función cuando x tiende al infinito: x
10
100 1 000 10 000 100 000 1 000 000 …
x 8 +@ y 8
y = 1/x
Solución:
. L . S , o ñ u r B l a i r o t i
x
10
100 1000 10000 100000 1000000 …
y = 1/x
0,1 0,01 0,001 0,0001 0,00001 0,000001 …
x 8 +@ y 8 0
APLICA LA TEORÍA 6
Calcula mentalmente los siguientes límites: a) lím
(x4 –
7x3
+ x – 5)
Solución:
a) lím (x4 – 7x3 + x – 5) = + @
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7
Calcula los siguientes límites y representa la función correspondiente: correspondiente: a) lím
x82
x2 – 4 x–2
b) lím
x 8 – 4
x+4 x2 + 4x
8
Calcula mentalmente los siguientes límites: a) lím
5x3 + 4x 2x3 + 1
b) lím
c) lím
4n3 + 1 2n3 – 3
d) lím
e) lím
n2 + 5 4n3 – 3
f) lím
x8+@
n8+@
Solución:
[]
x2– 4 0 (x + 2)(x – 2) a) lím ——— = — — = lím ————— = x8 2 x – 2 x 8 2 0 x–2
n8+@
– x4 + 5x x 8 – @ 7x3 – 4 – x4 + 5x x 8 + @ 7x3 – 4
x 8 – @
5x3 + 4x 2x3 + 1
= lím (x + 2) = 4 x8 2
Solución:
Gráfica:
5x3 + 4x 5 a) lím ———— = — x 8 + @ 2x3 + 1 2
Y x2 – 4 y = ——— x–2 X
– x4 + 5x b) lím ———— = +@ x 8 – @ 7x3 – 4 4n3 + 1 c) lím ———— =2 n 8 + @ 2n3 – 3
[]
x+4 0 x+4 — = lím ——— = b) lím ——— = — x 8 – 4 x2 + 4x x 8 – 4 0 x (x + 4) 1 1 — = lím — = – — x 8 – 4 x 4
– x4 + 5x d) lím ———— = – @ x 8 + @ 7x3 – 4 n2 + 5 e) lím ———— =0 n 8 + @ 4n3 – 3 5x3 + 4x 5 f ) lím ———— = — x 8 – @ 2x3 + 1 2
Gráfica: Y x+4 y = ——— x2 + 4x X
3. La derivada
PIENSA Y CALCULA Un coche va de Asturias a Andalucía; recorre 800 km en 8 horas. ¿Cuál ¿ Cuál es su velocidad media? Solución:
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APLICA LA TEORÍA Calcula la tasa de variación media de las siguientes funciones en el intervalo que se indica: 9
f(x) = 3x + 1 en [2, 4]
Calcula la función derivada aplicando la tabla de derivadas: 17
y=3
Solución:
Solución:
y’ = 0
f(4) – f(2) 13 – 7 TVM[2, TVM[2, 4] = ———— = ——— = 3 4–2 2
18
10
f(x) = x2 – 1 en [2, 3]
Solución:
f(3) – f(2) 8 – 3 TVM[2, TVM[2, 3] = ———— = ——— = 5 3–2 1
y=x
Solución:
y’ = 1 19
y = x2
Solución: 11
f(x) =
2 en [1, 3] x
y’ = 2x
Solución:
20
f(3) – f(1) 2/3 – 2 2 TVM[1, TVM[1, 3] = ———— = ——— = – — — 3–1 2 3
Solución:
12
y’ = 5x4
f(x) = √ x en [0, 4] 21
Solución:
f(4) – f(0) 2 – 0 1 TVM[0, TVM[0, 4] = ———— = ——— = — 4–0 4 2 Aplica la definición de derivada y calcula la derivada de las siguientes funciones en los puntos que se indica: 13
y = x5
f(x) = 2x + 3 en x = 1
Solución:
y’ = 5x4 + 2x + 1 22
y = 5x2 – 7x + 3
Solución:
y’ = 10x – 7
Solución:
f’(1) = 2
y = x 5 + x2 + x + 3
23
y = x3 + 3x2 – 4x + 2
Solución: 14
f(x) = – 3x + 1 en x = 2
y’ = 3x2 + 6x – 4
Solución:
f’(2) = – 3 15
. L . S , o ñ u r B l a i r o t i
f(x) = x2 en x = 3
24
y = (3x + 5)4
Solución:
y’ = 12(3x + 5) 3
Solución:
f’(3) = 6 16
f(x) = – x2 + 3 en x = 2
25
y = ex
Solución:
y’ = ex
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32
Solución:
y’ = 3e3x – 5 27
Solución:
y’ = 1 + L x
y=Lx
33
Solución:
1 y’ = — x 28
y=xLx
y = ex L x
Solución:
y = L (3x – 1)
ex y’ = ex L x + — x ex x
Solución:
34
3 y’ = —— 3x – 1
Solución:
29
y=L
(x2
+ 5x – 6)
y=
(x – 1) ex y’ = ——— x2
Solución:
2x + 5 y’ = ———— x2 + 5x – 6
35
y=
2x + 3 x
Solución: 30
y = 7x
Solución:
3 y’ = – — x2
y’ = 7 36 31
y = x ex
y=
5x – 1 3x + 2
Solución: Solución:
y’ = (x +
1)ex
13 y’ = ——— (3x + 2)2
4. Aplicaciones de la derivada
PIENSA Y CALCULA Si la pendiente de una recta es m = 2, calcula la pendiente m 2 de cualquier recta perpendicular. Solución:
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APLICA LA TEORÍA 37
Halla la recta tangente a la curva y = x2 + 2x para x = 1. Dibuja la función función y la recta tangente.
Solución:
y’ = 2x – 6
Solución:
2x – 6 = 0, 0, x = 3, 3, y = –4,A(3, –4,A(3, – 4)
Recta tangente: y = 4x – 1
y’’ = 2 f’’(2) = 2 > 0 ò A(3, – 4) mínimo mínimo relativo. relativo.
Y
Y
f(x) = x2 + 2x
P(1, 3)
f(x) = x2 – 6x + 5
X
X y = 4x – 1 A(3, – 4) 38
Calcula la recta normal a la curva y = x 2 – 5 para x = 2. Dibuja la función y la recta normal. normal.
41
Solución:
Halla los máximos y mínimos relativos de la función y = – x2 + 4x. Dibuja la función.
Solución:
1 1 Recta norma normal:l: y = – — — x – — — 4 2
y’ = –2x + 4 – 2x + 4 = 0, 0, x = 2, 2, y = 4,A(2, 4,A(2, 4)
Y
y’’ = –2
f(x) = x2 – 5 X 1 1 y = – — — x – — — 4 2
f’’(2) = –2 < 0 ò A(2, 4) Máximo relativo. relativo. Y A(2, 4)
P(2, – 1)
X
39
Halla las rectas tangente y normal a la curva y = x2 para x = 2. Dibuja la función y las rectas rectas tangente y normal. 42
Solución:
Recta tangente: y = 4x – 4 1 9 Recta norma normal:l: y = – — — x + — 4 2 Y f(x) = x2
. L . S , o ñ u r B l a i r o t i
f(x) = –x2 + 4x
1 9 y = – — — x + — 4 2 P(2, 4) X y = 4x – 4
Calcula el crecimiento de la función y = x2 – 2x – 3. Dibuja la función.
Solución:
Hay que hallar previamente los máximos y mínimos relativos: y’ = 2x – 2 2x – 2 = 0, 0, x = 1, 1, y = –4,A(1, –4,A(1, – 4) y’’ = 2 f’’(1) = 2 > 0 ò A(1, – 4) mínimo mínimo relativo. relativo. Crecimiento:
Discontinuidades: Discontinuidades: no hay.
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44
y’ = 2x – 2 f’(0) = – f ’(x)
–
x
Calcula el crecimiento crecimiento de la función y = 3x. Dibu ja la función.
Solución:
+
y’ = 3 > 0, es siempre creciente. creciente.
0 1
( 8) = (1, + @)
Y
(8 ) = (– @, 1) Y
X f(x) = 3x X
f(x) = x2 – 2x – 3 A(1, – 4)
43
Halla el crecimiento de la función y = – x2 + 6x – 4. Dibuja la función.
45
Solución:
Hay que hallar previamente los máximos y mínimos relativos:
Halla el crecimiento de la función y = – 2x. Dibuja Dibuja la función.
Solución:
y’ = – 2 < 0, es siempre siempre decreci decreciente. ente.
y’ = –2x + 6
Y
– 2x + 6 = 0, 0, x = 3, 3, y = 5,A(3, 5,A(3, 5) y’’ = – 2 f(x) = –2x
f’’(3) = –2 < 0 ò A(3, 5) Máximo relativo. relativo.
X
Crecimiento:
Discontinuidades: Discontinuidades: no hay. f’(x) x
0 1
3
y’ = –2x + 6 f’(0) = + f ’(x) x
( 8) = (– @, 3)
+ 0 1
– 3
46
Calcula los máximos y mínimos relativos de la función y = x3 – 3x
Solución:
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Ejercicios y problemas 1. Funciones especiales 47
51
Representa la siguiente función:
Represent Representaa la siguiente siguiente función: función: y = Ent(x/2)
y=
Solución:
2x
si x Ì 0
– – x2
si x > 0
{
Solución:
Y
Y X X
48
Representa la siguiente función: 52
y = Signo(x2 – 1)
Representa la siguiente función: y=
Solución: Y
{
–x
si x < 1 si x Ó 1
log1/2 x
Solución: Y X
X
49
Representa la siguiente función: y = |x2 – 2x – 3|
2. Límites
Solución: Y
53
Calcula mentalmente los siguientes límites: a) lím (– x3 + 5x – 3) x8 +@
X
b) lím (– x3 + 5x – 3) x 8 – @
y = |x2 – 2x – 3|
Solución:
a) lím (–x3 + 5x – 3) = –
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Ejercicios y problemas Gráfica:
Solución:
5x4 – 1 a) lím ———— = – 5 x 8 + @ – x4 + 2x
Y 2x + 4 y = ——— x+2 X
5x4 – 1 b) lím ———— = – 5 x 8 – @ – x4 + 2x 58
55
Calcula el siguiente límite: lím x – 3 x 8 3 x2 – x – 6 Representa la función correspondiente. correspondiente.
Solución:
[]
x–3 0 x–3 lím ———— — = lím ————— = = — 2 x 8 3 x–x–6 0 (x + 2)(x – 3)
x8 3
1 1 = lím —— = — x8 3 x + 2 5
Solución:
3n2 – 5 a) lím ———— =0 n 8 + @ n4 + 2n n3 + n b) lím ———— = – 1 n 8 + @ – n3 – 2n 59
Gráfica: Y x–3 y = ——— x2 – x – 6 X
Calcula mentalmente los siguientes límites: 3n2 – 5 a) lím 4 n 8 + @ n + 2n n3 + n b) lím n 8 + @ – n3 – 2n
Calcula mentalmente los siguientes límites: – x5 + x2 x 8 + @ x2 – x – x5 + x2 b) lím x 8 – @ x2 – x
a) lím
Solución:
– x5 + x2 a) lím ———— = – @ x 8 + @ x2 – x 56
Calcula mentalmente los siguientes límites: a) lím – 2x + 7 x 8 + @ x2 + 1 b) lím – 2x + 7 x 8 – @ x2 + 1
– x5 + x2 b) lím ———— = +@ x 8 – @ x2 – x
3. La derivada Calcula la tasa de variación media de las siguientes funciones en el intervalo que se indica:
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62
6 en [2, [2, 3] x
f(x) =
Solución:
y’ = 7x6
Solución:
f(3) – f(2) 2 – 3 TVM[2, TVM[2, 3] = ———— = ——— = – 1 3–2 1
71
y = x7 – x3 + x + 9
Solución: 63
f(x) f(x) = √ x + 5 en [– 1, 4]
Solución:
y’ = 7x6 – 3x2 + 1 72
f(4) – f(– 1) 3 – 2 1 TVM[ TVM[–– 1, 4] = ———— = ——— = — 4+1 5 5
y = 3x2 – 4x + 1
Solución:
y’ = 6x – 4 Aplica la definición de derivada y calcula la derivada de las siguientes funciones en los puntos que se indica: 64
f(x) = 3x + 1 en x = 2
Solución:
73
y = x3 – 5x2 + 3x – 8
Solución:
y’ = 3x2 – 10x + 3
f’(2) = 3 74 65
f(x) = – 2x + 3 en x = 1
Solución:
y = (2x – 3)5
Solución:
y’ = 10(2x 10 (2x – 3) 3)4
f’(1) = – 2 75 66
f(x) =
x2
en x = – 3
y = e – 2x + 3
Solución: Solución:
f’(–3) = – 6 67
f(x) = – x2 + 5 en x = 1
Solución:
f’(1) = – 2 Calcula la función derivada aplicando la tabla de derivadas:
y’ = – 2e –2x + 3 76
y = L (5x + 2)
Solución:
5 y’ = —— 5x + 2
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Ejercicios y problemas Solución:
y’ = (x +
Y
2) 2) ex P(3, 3)
f(x) = x2 – 2x
X 80
y = x L (x – 5) y = 4x – 9
Solución:
x y’ = L (x – 55)) + —— x–5
81
y = e3x L x
Solución:
e3x y’ = 3e3x L x + — x
82
y=
86
Calcula la recta normal a la curva y = – x2 + 5 para x = 2. Dibuja la función y la recta normal. normal.
Solución:
1 1 Recta normal: normal:yy = — x + — 4 2 Y 1 x — 1 y = — + 4 2 P(2, 1) X
e2x x
Solución:
f(x) = –x2 + 5
(2x – 1)e 1) e2x y’ = ——— 2 x 87
83
y=
x x–1
Halla las rectas tangente y normal a la curva y = x2 para x = 1. Dibuja la función función y las rectas tangente y normal.
Solución:
Solución:
Recta tangente: y = 2x – 1
– 1 y’ = —— (x – 1)2
1 3 Recta norma normal:l: y = – — — x + — 2 2 Y f(x) = x2
84
y=
3x + 5 2x – 1
Solución:
P(1, 1)
X 1
3
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Y
Y f(x) = x2 – 4x
f(x) = x2 – 6x + 4 X
X
A(2, – 4)
89
A(3, – 5)
Halla los máximos y mínimos relativos de la función y = – x2 + 6x – 5. Dibuja la función. función.
91
Solución:
y’ = –2x + 6
Halla el crecimiento de la función siguiente: y = – x2 + 2x + 3. Dibuja la función. función.
Solución:
– 2x + 6 = 0, 0, x = 3, 3, y = 4,A(3, 4,A(3, 4) y’’ = – 2 f’’(3) = –2 < 0 ò P(3, 4) Máximo Máximo relativ relativo. o. Y
Hay que hallar previamente los máximos y mínimos relativos: y’ = –2x + 2 – 2x + 2 = 0, 0, x = 1, 1, y = 4,A(1, 4,A(1, 4)
A(3, 4)
y’’ = – 2 X
f’’(1) = –2 < 0 ò A(1, 4) Máximo relativo. relativo. Crecimiento:
f(x) = –x2 + 6x – 5
Discontinuidades: Discontinuidades: no hay. f’(x)
90
Calcula el crecimiento de la función siguiente: 2 – 6x + 4. Dibuja la funció
x
y’ = –2x + 2
0 1
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Ejercicios y problemas 94
Y
X f(x) = 2x
Calcula los máximos y mínimos relativos de la función y = – x3 + 3x
Solución:
y’ = – 3x2 + 3 –3x2 + 3 = 0, x2 – 1 = 0, x2 = 1, 1, x = 1, x = – 1 x = 1, 1, y = 2,A(1, 2,A(1, 2) x = –1,y = –2, B(–1,– 2)
93
Halla el crecimiento de la función y = – 3x. Dibuja Dibuja la función.
y’’ = – 6x f’’(1) = – 6 < 0 ò A(1, 2) Máximo relativo. relativo. f’’(– 1) = 6 > 0 ò B(–1, B(– 1, – 2) mínimo mínimo relati relativo vo..
Solución:
y’ = – 3 < 0, es siempre siempre decrecien decreciente. te. Y
f(x) = – 3x
X
Para ampliar 95
Representa la siguiente función:
{
2x
si x Ì 1
¿Puede haber más de una ecuación? Solución:
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Y
102
Calcula mentalmente los siguientes límites: 2n3 + 1 n 8 + @ 5n2 – 7n
a) lím X
b) lím
n8 +@
n2 + 5n n2 – 3n
Solución: Solución:
y=
99
{
x2 + 2x – 3
si x Ì 1
– 3x + 5
si x > 1
Calcula mentalmente los siguientes límites:
2n3 + 1 a) lím ———— = +@ n 8 + @ 5n2 – 7n n2 + 5n b) lím ———— =1 n 8 + @ n2 – 3n 103
–6x3 + 9 x 8 + @ 2x3 – 3
a) lím (x3 – 5x2 – x + 7)
a) lím
x81
b) lím
x80
5x3 + x2 – 10x + 6 x3 + 2x2 – 3
Solución:
a) lím (x3 – 5x2 – x + 7) = 2 x8 1
5x3 + x2 – 10x + 6 b) lím ——————— = – 2 x80 x3 + 2x2 – 3
100
Calcula mentalmente los siguientes límites:
Calcula mentalmente los siguientes límites:
–6x3 + 9 x 8 – @ 2x3 – 3
b) lím
Solución:
–6x3 + 9 a) lím ———— = – 3 x 8 + @ 2x3 – 3 –6x3 + 9 b) lím ———— = – 3 x 8 – @ 2x3 – 3 104
Calcula mentalmente los siguientes límites:
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Ejercicios y problemas 106
Calcula el siguiente límite: lím
x8 2
x2 – 4x + 4 x2 – 2x
Solución:
[]
x2– 4x + 4 0 (x – 2) 2 lím lím ———— —— ——— — = — — = lím ——— = 2 x8 2 x 8 2x (x – 2) x– 2x 0 x–2 lím —— = 0 x8 2 x 107
Calcula el siguiente límite: x3 – x2 lím 3 x 8 1 x + 2x2 – 3x
[]
x 1 = lím —— = — x8 1 x + 3 4
x 8 –2
Aplica la definición de derivada y calcula la derivada de las siguientes funciones en los puntos que se indica: f(x) = 4x – 1 en x = 2
Solución:
f’(2) = 4 f(x) = – x2 + 5 en x = 3
Solución:
f’(3) = – 6 Calcula la función derivada aplicando la tabla de derivadas:
Calcula el siguiente límite: lím
f(1) – f(– 11)) 1 – 1 TVM[ TVM[–– 1, 1] = ———— = ——— = 0 1+1 2
113
x3 – x2 0 x2 (x – 1) lím ———— lím — — ————— = = = x 8 1 x3 + 2x2– 3x x 8 1 x (x – 1)(x + 3) 0
f(x) = x2 en [– 1, 1]
Solución:
112
Solución:
108
111
x2 + 4x + 4 x2 + 3x + 2
114
y = 4x4 – 5x2 – 6x + 2
Solución:
y’ = 16x3 – 10x – 6
Solución:
[]
x2 + 4x + 4 0 (x + 2)2 — — ————— lím ———— lím = = = –2 2 + 3 + 2 –2 ( + 1)( + 2) 0
115
y = (5x + 1)4
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Solución:
125
y’ = x ex
Calcula los máximos y mínimos relativos de la función y = x2. Dibuja la función. función.
Solución: 120
y = (2x + 1) L x
y’ = 2x
Solución:
2x = 0, x = 0, 0, y = 0,A(0, 0,A(0, 0)
2x + 1 y’ = 2 L x + —— x
y’’ = 2
121
f’’(0) = 2 > 0 ò A(0, 0) mínimo relativo. relativo. Y
2x + 3 y= 4x – 5
f(x) = x2 X
Solución:
A(0, 0)
–22 y’ = —— (4x – 5)2 122
y=
– 2x + 1 3x + 4
Solución:
–11 y’ = —— (3x + 4)2 123
Halla la recta tangente a la curva y = x2 – 1 para x = 2. Dibuja la función función y la recta tangente.
Solución:
126
Halla los máximos y mínimos relativos de la función y = – x2. Dibuja la función. función.
Solución:
y’ = – 2x – 2x = 0, 0, x = 0, y = 0,A(0, 0,A(0, 0) y’’ = –2 f’’(0) = –2 < 0 ò A(0, 0) Máximo relativo. relativo. Y
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Ejercicios y problemas Problemas 128
Representa la siguiente función: y=
{
Solución:
[]
()
si x Ì 0
x3– 3x + 2 0 lím ——— — = = — 4 x 8 1 x – 4x + 3 0
|log1/2 x|
si x > 0
(x – 1)(x2 + x – 2) 0 — = = lím ——————— = — x 8 1 (x – 1)(x3 + x2 + x – 3) 0
1 2
x
Solución:
[]
(x – 1)(x + 2) x+2 = lím —————— = lím ———— = 2 2 x 8 1 (x – 1)(x + 2x + 3) x 8 1 x + 2x + 3
Y
X
3 1 = — = — 6 2 132
Dibuja la siguiente función afín: y = 2x – 3 a) Halla mentalmente mentalmente la pendiente. pendiente.
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a) m = – 2
Solución:
b) y’ = – 2
Recta tangente: y = 2x – 10
c) Como m = y’ y’ = – 2 < 0 siempre, siempre, la función función siemsiempre es decreciente.
1 5 Recta norma normal:l: y = – — — x – — — 2 2 Y
134
f(x) = x2 – 4x – 1
Dibuja la siguiente parábola: y = x2 – 4x + 1
X
a) Viendo la gráfica, gráfica, halla el máximo máximo o mínimo mínimo relativo.
y = 2x – 10 1 5 y = – — — x – — — 2 2
b) Viendo la gráfica, halla el crecimiento. crecimiento. c) Halla el máximo relativo o mínimo relativo relativo derivando. d) Halla el crecimiento crecimiento derivando. derivando.
136
Halla el crecimiento de la función: y = x2 + 6x + 5 Dibuja la función.
Solución: Y
P(3, – 4)
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Ejercicios y problemas Solución:
Calcula lím f(x), lím f(x), esboza la gráfica de
6 — y’ = – — < 0, es siempre siempre negativa, decrecien decreciente. te. x2
la función.
x8 +@
x 8 – @
Discontinuidades: Discontinuidades: x = 0
Solución:
( 8) = Ö
Máximos y mínimos relativos:
y’ = x2 – 4
(8 ) = (– @, + @)
x2 – 4 = 0, x2 = 2, 2, x = 2, x = – 2
Y
x = 2, 2, y = –16/3,A(2, –16/3,A(2, – 16/ 16/3) 3) x = – 2, 2, y = 16/3, 16/3, B(–2, 16/ 16/3) 3) X
y’’ = 2x f’’(2) = 4 > 0 ò A(2, – 16/3) mínimo mínimo relativo. relativo.
f(x) = 6/x
f’’(–2) = –4 < 0 ò B(– 2, 16/3) Máximo relativo. relativo. Crecimiento:
138
Halla los máximos y mínimos relativos y el crecimiento de la función:
Discontinuidades: Discontinuidades: no hay. f’(x)
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x = – 2, y = – 16 16/3 /3,, B(– B(– 2, – 16 16/3 /3))
Solución:
y’’ = – 2x
y’ = – 2x + 18
f’’(2) = –2 < 0 ò A(2, 16/3) Máximo relativo. relativo.
– 2x + 18 18 = 0, 2x – 18 = 0, 0, x = 9, 9, y = 61
f’’(–2) = 2 > 0 ò B(–2, B(– 2, – 16/3) mínimo mínimo relati relativo vo..
y’’ = – 2 f’’(9) = –2 < 0 ò A(9, 61) Máximo relativo. relativo.
Crecimiento:
Los máximos beneficios los alcanza en el 9º año y son 61 millones de euros.
Discontinuidades: Discontinuidades: no hay. f’(x) x
– 2
0
2
Para profundizar
y’ = x2 – 4
143
f’(1) = – f ’(x) – x
– 2
+ 0
– 2
( 8) = (–2, 2) ( ) = (– @, – 2 ) á (2, (2, + @) 8
Representa la siguiente función:
{
2x2 + 8x + 3 y= x+3 x+1 Solución: Y
si x < 0 si x Ó 0
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Ejercicios y problemas f’(x) + x
–
+
Y
– 1 0 1
( 8) = (– @, – 1 ) á (1, (1, + @)
X
(8 ) = (–1, 1)
f(x) = 2/x2
Límites:
lím x3 – 3x = + @
x8 +@
lím x3 – 3x = – @
x 8 – @
146
Y B(– 1, 2) X f(x) = x2 – 3x
A(1, – 2)
Las pérdidas de una empresa en millones de euros vienen dadas por la fórmula: y = – x2 + 8x donde x indica el número de años que lleva funcionando.¿Qué nando. ¿Qué año alcanza las máximas pérdidas?
Solución:
y’ = –2x + 8 2x + 8 = 0, x – 4 = 0, x = 4, y = 16
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Aplica tus competencias 148
El espacio que recorre un móvil es e(t) = 3t2 + 2t + 5, donde t se expresa en segundos, y e(t), en metros. Calcula la velocidad que lleva en el instante t = 4 s
149
El espacio que recorre un móvil es e(t) = 5t2 – 3t + 1, donde t se expresa en segundos, y e(t), en metros. Calcula la aceleración que lleva en el instante t = 2 s
Solución:
Solución:
v(t) = e’(t) = 6t + 2 v(4) = 6 · 4 + 2 = 24 + 2 = 26 m/s
v(t) = e’(t) = 10t – 3 a(t) = v’(t) = 10
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Comprueba lo que sabes 1
Define función parte entera y represéntala.
Solución: La función parte entera de x asigna a cada x su
parte entera. Se representa por y = Ent(x) Y y = Ent(x)
b) lím
x8– 4
[]
x+4 = — 0 = lím —— x+4 = —— 2
x + 4x 0 1 = –— 1 = lím — x8– 4 x 4
x8 – 4
Gráfica: Y
x(x + 4)
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Solución:
a) y’ = 12(3x – 5) 3 b) y’ = 5e5x + 1 7 c) y’ = ——— 7x – 2 d) y’ = 2x e x + x2ex = xex(2 + x) 1 1
2 f(x) = 4x – x 2 donde x se expresa en semanas, y f(x), en miles de personas. Calcula el número medio de enfermos de gripe durante la 2 ª y la 4 ª semanas; y entre la 4 ª y la 6ª semanas. Interpreta los resultados.
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Linux/Windows Paso a paso 150
lím (x3 – 2x2 – x + 3)
Representa la función parte decimal de x, indica si es periódica y halla el período.
Solución:
Resuelto en el libro del alumnado.
x8 +@
Solución:
Resuelto en el libro del alumnado.
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Windows Derive Practica 155
Representa la función signo de x. Halla cuándo no es continua.
Solución:
Solución:
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The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Linux/Windows
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Windows Derive
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
The world’s largest digital library
Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.
Linux/Windows
Windows Derive