# How do you factor completely 16x^2 - 25y^2?

$\left(4 x - 5 y\right) \left(4 x + 5 y\right)$
16x^2−25y^2
$= {\left(4 x\right)}^{2} - {\left(5 y\right)}^{2}$
$\approx {a}^{2} - {b}^{2} = \left(a - b\right) \left(a + b\right)$
$= \left(4 x - 5 y\right) \left(4 x + 5 y\right)$