# How do you factor -3x^2-36x+108?

$- 3 {x}^{2} - 36 x + 108$
$\text{ extract the common constant factor}$
$\left(- 3\right) \left({x}^{2} + 12 x - 36\right)$
$\text{ recognize the second term as a square}$
$\left(- 3\right) {\left(x - 6\right)}^{2}$