split the middle term of x^2+12x-160
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Split 12 into 20 and -8
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x²+12x-160=0
x²+20x-8x-160=0
x(x+20)-8(x+20)=0
(x-8)(x+20)=0
x=8,-20
x²+20x-8x-160=0
x(x+20)-8(x+20)=0
(x-8)(x+20)=0
x=8,-20
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