You can put this solution on YOUR website! How would I factor 15x^2-4x-4=0?
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You find a pair of factors of 15, and a pair of 4 that give the product.
It's trial and error, having someone do it for you doesn't accomplish anything.
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(ax + b)*(cx + d) = 15x^2-4x-4
a*c = 15
b*d = -4