# How do you factor x^2 - 16y^2?

Apr 2, 2018

This is known as the difference of two squares

#### Explanation:

Referring to the difference of two squares

${x}^{2} - 16 {y}^{2}$
$= {x}^{2} - {\left(4 y\right)}^{2}$
$= \left(x - 4 y\right) \left(x + 4 y\right)$

$a = X$
$b = 4 y$