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December 21, 2014

December 21, 2014

Posted by **Meloney** on Wednesday, May 6, 2009 at 5:26pm.

(x+1)(x-3)=117

I simplified and got:

x^2-3x+x-3=117

x^2-2x-3=117

x^2-2x-120=0

I split the middle term and got:

x^2-12x+10x-120=0

What should I do next? I have no idea how to finish factoring this...

thanks,

meloney

- Algebra 1 -
**Reiny**, Wednesday, May 6, 2009 at 5:43pmnow you want to factor by "grouping"

x^2-12x+10x-120=0

x(x-12) + 10(x-12) = 0

((x-12)(x+10) = 0

so x= 12 or x = -10

- Algebra 1 -
**Meloney**, Wednesday, May 6, 2009 at 5:46pmwow I never would have thought of grouping them. Thanks!!!

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