If that's x^2 + x - 42, that factors to (x + 7)(x - 6)
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9 - x2 will factor into (3 - x)(3 + x)
x2-9x = x(x-9)
x2-49 = (x-7)(x+7)
X2 - 16(X - 4)(X + 4)============X2 + 16===========not factorable in real numbers
x2 + 2x - 3 = (x + 3)(x - 1)