0
Anonymous
x = 3;
x - 2 = -3 - 2 = -5
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-x2 = x - 6 x2 + x - 6 = 0 (x - 2)(x + 3) = 0 x ∈ {-3, 2}
-4
3
x2 - x - 6 = (x - 3)(x + 2) = 0; whence, x = 3 or -2.
x2 + 2x - 15 = (x - 3)(x + 5)