# How do you factor 4y^2-20yz+25z^2?

$4 {y}^{2} - 20 y z + 25 {z}^{2}$
$= {\left(2 y\right)}^{2} + 2 \left(2 y\right) \left(- 5 z\right) + {\left(- 5 z\right)}^{2}$
$= {\left(2 y - 5 z\right)}^{2}$