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Unit 3 Challenge Problems
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Unit 3 Challenge Problems
Challenge Problems for Precalculus students. This accompanies our Unit 3 - Logs and Exponents...
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IB Precalculus Unit 3: Logarithms and Exponents Challenge Problems (No Calculator) Source:
A. Simplify. 1 81
1. log 9
2. log 0.001 10
4. 3e3 ln x
5. log 4
7. ln e log 2 4
8. e ln 2ln 6
9. e 3 ln12 ln 4
10.
2 ln e x 2 x
11.
ln 2e x
e5 ln 1 / 2
14.
e ln 1 / 2 ln 2 / 3 15.
e 2ln 2
17.
e 2ln 2 18.
20.
10 ln e 21.
23.
23 log2 5
24.
16 8
26.
ln
e4 / 3 e
27.
e 2 ln 3 e 2
29.
ln x log x 3
e
6. log 3 log 3 log3 27
4 2
2
ln 3
13. log 2 log10000 16. 16 2 log1 / 4 3 2
19.
ln ln log10
1 ln a t t
e xln x
22. e
3
3. log 0.2 125
e
2
2 x
12.
b ln a
3
25.
log 2
ln a b ln a c bc
28.
ln 3
ln 3 x ln x 2 9
30.
B. Solve for x. 1. 5 x 25 x1
2. 32 x1 27
3. e ln x 3
4. 3 x
5. 34 x 9 x1
6. 100
7. 32 x 3x 27
8. e 2 x e 5 x e14
9.
10.
9 2x 6x
11.
9 3x 9 x
2 x 3x 1
14.
2 x 4 x
23 x 2
17.
2 x 32 x1 6 x 18.
4 2 x1 32 x 3
20.
e2 x e x 2
21.
e x 3 2e x
23.
2 1 x x e e
24.
26.
4 x 4 x 8 2
27.
29.
3 42 x 5 4 x 2
32.
log3 (log 5 x) 1
35.
log 9 x 0.5
2
3 x
9 3 x 7
2
2 x
18 3 2x
3x
523 x 25 x
19. 4 4
x
x 1
5 x 2
12.
1 8
15.
4
x 1
0
22.
1 27
16.
x
5
10
6
13. 81 5
x
4 2 x 2 x 17
25.
2 4 x 4 x
9 2
3 x 8 3 x 9
28. 30.
4 x1 41 x 10 3 x 3 x 9 3 x 3 x
31.
4 6 x 2e 3 ex
33.
log x 9
34.
log x 1
log x 25 2
2 3
36.
log 4 x 2
38.
ln x 0
log x 3 5 x 1
41.
ln ln e x 1 42.
43. 45.
log x 2
2
44.
log 6
46. 48.
ln ln x 1
47.
log5 x 1 2 4
ln
49.
log x 14 5 x 2
50.
4 log 4 x 6
52. 54.
ln 4e x 1 ln e ln x 2
53.
log 6 6 4 x1 19
37. 2 log x 1
40.
2
log x
39.
2
log 9 2 x 1 2
2 log 3 x 2 4
55.
ln e 2 ln e ln e x
x
x 1 4
ln x
log x 2 11log x 10 0
56.
4
log x 2 2 log x 3
58.
59.
ln x ln x 1 1
60.
61.
log 2 x log 2 x 2 2
63.
log 4 x log8 2 x
57.
2 log x 5 log x 3 2
log 4 x log16 5 x 6
log x log x 9 1
log 5 3 x log 5 x 3 1
65. 3 log 4 x 2 5 67.
log 3 x log 3 x 8 2
69.
log 2 x 1
2
4 log 2 x 1
62.
64.
log 7 2 x 1 log 7 3 x 8
66.
log 2 x log 2 x 2 3 68. log 2 x log 2 x 7 3
70.
51.
71.
log 2 x 2 log 2 x 2 3
73.
log x 1 log x 1 1
log3 x log 3 x 3 2 log 2 x 1 log x 2 1
72.
74.
log x 3 log x 1 log x 76.
75. ln x ln x ln x 10 2
3
5
77.
ln x 2 ln x 3 ln x 4 1 78. 2 x
ln x 3 ln 2 ln
79. 80.
log 2 ( x 1) log 2 3 x 5 log 2 5 x 3 2 ln 4 x 2 ln 4 ln x 2
C. Follow the instructions for each problem. 1. Find the domain. x 1 2 x 4
(b) f ( x) ln 3x 5 ln x
(a) f ( x) ln 2. Find f
1
(a) f (t )
(t ) .
et e t 2
(b) f (t ) ln ln t
3. Let f ( x) 2 x 3 and g ( x) ln x . Find (a) f g x 4. Find all x so that
(b) g f x 1 e2 x 5
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