Question

solve for $f$.
$f^2 = 81$
write your answers as integers or as proper or improper fractions in simplest form.
$f = \square$ or $f = \square$
save answer

Explanation:

Step1: Take square root of both sides

$\sqrt{f^2} = \sqrt{81}$

Step2: Solve for both roots

$f = \pm 9$

Answer:

$f = 9$ or $f = -9$