# How do you factor completely -R^2+46R-45?

Dec 31, 2015

$= - \left(R - 45\right) \left(R - 1\right)$
First take out the factor of $- 1$
$- {R}^{2} + 46 R - 45 = - \left({R}^{2} - 46 R + 45\right)$
$= - \left(R - 45\right) \left(R - 1\right)$