SOLUTION: Im having problem with my Factoring (x^2+bc+c)<-example I got it down pat untill i come to something like r^2+3r-10 (r^2 is R squared) what always gets me is negatives i half t

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Question 733807: Im having problem with my Factoring (x^2+bc+c)<-example
I got it down pat untill i come to something like r^2+3r-10 (r^2 is R squared)
what always gets me is negatives i half to solve it in a way such as (r+3)(r+-6)We are factoring Trinomials and i just cant find awnsers to Problems with a negative
Hope you can help
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
r^2+3r-10
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The AC Method:
A*C: 2*-5 = -10
B :: 2+-5 = 3
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Use reverse FOIL to get:
r^2 + (2r-5r) -10
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Factor each pair as follows:
(r^2+2r) + (-5r-10)
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r(r+2)-5(r+2)
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= (r+2)(r-5)
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Cheers,
Stan H.
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