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

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Answer 1 · 2015-12-31T13:50:53

$=-(R-45)(R-1)$

First take out the factor of $-1$
$-R^2 +46R-45 = -(R^2 - 46R +45)$
Then find factors of 45 that add to give 46 , which are 45 and 1
$=-(R-45)(R-1)$

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