x2+7x-30 splitting the middle term
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x^2+7x-30
x^2+10x-3x-30
x(x+10)-3(x+10)
(x+10)(x-3)
x=-10,x=3
x^2+10x-3x-30
x(x+10)-3(x+10)
(x+10)(x-3)
x=-10,x=3
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