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How do you factor # r^2 + 2r - 63#?

1 Answer

Jan 28, 2017

#r^2+2r-63=(r-7)(r+9)#

Explanation:

First notice that

#r^2+2r-63=r^2+(9-7)r+(-7)(9)#

Then

#r^2+2r-63=(r-7)(r+9)#

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