# How do you factor 9+16c^2-24c using the perfect squares formula?

$= {\left(4 c - 3\right)}^{2}$
$9 + 16 {c}^{2} - 24 c$
$= 16 {c}^{2} - 24 c + 9$
$= {\left(4 c\right)}^{2} - 2 \left(4 c\right) 3 + {3}^{2}$
$= {\left(4 c - 3\right)}^{2}$