# Chapter 9 - Quadratic Functions and Equations - 9-3 Solving Quadratic Equations - Practice and Problem-Solving Exercises: 18

$$a = \pm18$$

#### Work Step by Step

First you find the square root of both sides $$a = \sqrt 324$$ $$a = \pm18$$ That is your final answer since the variable is alone now. Remember you always have to put the plus or minus sign ($\pm$) because any number under the square root that is above $0$ has $2$ has answers.

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