X2 + 3X - 18 = 0
What two factors of - 18 add up to 3 ??
(X - 3)(X + 6)
============so, by the zero sum rule,
X = 3
X = - 6
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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
No.
168