Evaluate f(x)=3^-2

$f (x) = 3^{- 2}$

Simplify $3^{- 2}$ .

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$f (x) = \frac{1}{3^{2}}$

Raise $3$ to the power of $2$ .

$f (x) = \frac{1}{9}$

Subtract $f (x)$ from both sides of the equation.

$0 = \frac{1}{9} - f (x)$

Rewrite the equation as $\frac{1}{9} - f (x) = 0$ .

$\frac{1}{9} - f (x) = 0$