If you're looking to solve for x, you can do so as follows:
x2 + 12x - 6 = 0
x2 + 12x + 36 = 42
(x + 6)2 = 42
x + 6 = ± √42
x = -6 ± √42
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x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
-2
x2 + 49 = 0 ∴ x2 = -49 ∴ x = 7i
168
No.