(x + 7)(x - 6)
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(x2 plus 40) (x minus 1)
-x2 + x + 42 = -[x2 - x - 42] = -[x2 - 7x + 6x - 42] = -[x*(x - 7) + 6*(x - 7)] = -(x - 7)*(x + 6)
44
This is not factorable. You would have to do the quadratic formula for this problem.
(x - 12)(x - 7)