x^2 + 4x - 12 = 0 since we have -12, its factors are with different sign;
(x + )(x - ) = 0
since we have 4x, that means that factors are 6 and 2, and 6 will be positive, so we have:
(x + 6)(x - 2)= 0
x = -6 or x = 2
(check)
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