Evaluating Exponential Functions
Notes!
Review f(x) = 3x + 2 What is f(2) ? f(2) = 3(2) + 2 = 6 + 2 = 8 f(2) = 8
Evaluate the following functions at -1, 0 , 1. {for example f(-1), f(0), f(1) }
1. f(x) = 3^x .
f(-1) = 1/3
f(0) = 1
f(1) = 32. f(x) = 3^(x-1)
f(-1) = 1/9
f(0) = 1/3
f(1) = 1
3.f(x) = 3^(x+2)
f(-1) = 3
f(0) = 9
f(1) = 27
More Examples to try!
Example 1:
9/8 * 2^n at n = 5
Answer: 36
Example 2:
5 • (1/2 )^x at x = -2
Answer: 20
Example 3:
3 • 2^n at n = 6
Answer: 192