#### Answer

$g = ±\frac{5}{2}$

#### Work Step by Step

First, let's divide $4$ from each side.
$g^2 = \frac{25}{4}$
$ \frac{25}{4}$ is either $ \frac{5}{2}$ multiplied by itself, or $ -\frac{5}{2}$multiplied by itself. If we square root both sides, we get
$g = ±\frac{5}{2}$