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OpenStudy (anonymous):
Factor the trinomial below. 7x2 - 42x - 49
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OpenStudy (callisto):
7x^2 - 42x - 49 = 7 (x^2 -6x -7) = 7 (x^2 - 7x +x-7) = 7 [ x(x-7) + (x-7)] = 7 (x+1)(x-7)
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