0
Anonymous
x2 + 12x - 64 = 0
∴ (x + 16)(x - 4) = 0
∴ x ∈ {4, -16}
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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