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Anonymous
x2 + x - 12 = (x + 4) (x - 3)
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(x + 4)(x - 3)
(x - 5)(x + 12)
(x - 12)(x + 12)
(2x+3)(2x+4)
3(x + 4)(x + 1)
(x2-7x+12)/(x2-2x-3)factor the numerator & denominator:(x-4)(x-3)/(x-3)(x-1)now reduce:(x-4)(x-3)/(x+1)(x-3)(x-4)/(x+1)