x2 + 20x + 4 = 0
x2 + 20x + 100 = 96
(x + 10)2 = 96
x + 10 = ±961/2
x = -10 ±961/2
x = -10 ±4√6
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x2=20x 0 is an obvious solution if x is not 0, then divide both side by x, so x=20 so the solutions are 0 and 20
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.