# How do you solve #16x^2 - 81 = 0# by factoring?

##### 2 Answers

Apr 30, 2018

#### Explanation:

Use the rule for difference of squares.

This equation will be true if either (4x-9) or (4x+9) is 0.

Or

Aug 10, 2018

#### Explanation:

Recall that this is a difference of squares which factors as

Both of our terms are perfect squares, where our

We can set both factors equal to zero to get

Hope this helps!