Chapter 9 - Quadratic Functions and Equations - 9-3 Solving Quadratic Equations - Practice and Problem-Solving Exercises - Page 564: 25

$g = ±\frac{5}{2}$

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 $g = ±\frac{5}{2}$