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Pre-Calculus
Unit 6 WS 6-4: Solving Log & Exponential Equations
Name: __________________________
Pd: _______
Solve each exponential or log equation. Check for extraneous solutions. Round to 2 decimal places
using a calculator!
1. 3.5x = 47.9
2. 7.2x-4 = 8.21
3.
42x = 9x-1
4. 73b = 12b+1
5. 2e x  10
6. ln x = 2
7. 3ln 5x = 10
8. 7  2e x  5
9. ln x  ln 12  0
12. log 2 8  log 2 16
11. ln e3  ln e 2
10. ln x  ln( x  1)  1
Graphing Review Questions:
Graph the following log or exponential functions:
1. f ( x)  2  x 1 - 3
2. f ( x)  2log3 ( x  4)  2
10
10
8
8
6
6
4
4
2
2
-10 -8 -6 -4 -2
2
4
6
8 10
-10 -8 -6 -4 -2
2
-2
-2
-4
-4
-6
-6
-8
-8
-10
-10
4
6
8 10