Question

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

Answer 1

`=-(R-45)(R-1)`

Explanation:

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)`