# How do you factor 25n²-9?

May 27, 2015

$25 {n}^{2} - 9 = {\left(5 n\right)}^{2} - {3}^{3}$
is the difference of squares
with a standard factoring:
$= \left(5 n + 3\right) \left(5 n - 3\right)$