Question

What is the value of f(x)=9^x when
x=-2

Answer 1

Answer:

1/81

Step-by-step explanation:

negative exponent means its a fraction

9^-2 =

1/9^2 =

1/81

Answer 2

Answer:

$f(-2) = \frac{1}{81}$

Step-by-step explanation:

Substitute x with -2.

$f(x)=9^x$

$f(-2)=9^{-2}$

Use exponental rule (negative exponent): $a^{-x} = \frac{1}{a^x}$

$f(-2) = \frac{1}{9^{2}}$

$f(-2) = \frac{1}{81}$