Question

What is the value of f(x)= 9^x when x=-2?
A) 1/8
B) 81
C) 1/18
D) 18

Answer 1

Substitute -2 in for x and get (9)^-2
Flip the equation so that the exponent is positive and get 1/9^2
Work it out 1/(9*9) = 1/81