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OpenStudy (anonymous):
Factor: x2 + 2x - 15 (x - 2)(x - 9) (x - 3)(x + 5) (x - 3)(x - 5) prime
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OpenStudy (chriss):
the trick is to find 2 numbers with a product equal to the last term and a sum equal to the coefficient of the middle term
OpenStudy (hoblos):
x2 + 2x - 15 = x2 + 5x -3x -15 = x(x+5)-3(x+5) = (x+5)(x-3)
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