If the expression is, x2 + 2x - 15 this has factors of (x + 5)(x - 3).
If the expression is, x2 - 2x - 15 then the factors are (x - 5)(x + 3)
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x2 + 2x - 15 = (x + 5)(x - 3)
-2x3-2x2+12x (-2)(x3+x2-6x) (-2x)(x2+x-6) (-2x)(x2+3x-2x-6) (-2x)((x)(x+3)-2(x+3)) (-2x)((x-2)(x+3)
-x2 + 2x + 48 = (-x - 6)(x - 8)
-x2 + 2x + 48 = (x +6)(8 - x)
-x2 + 2x + 48 = (-x - 6)(x - 8) = -(x + 6)(x - 8)