x2 - 8x = 1
∴ x2 - 8x + 16 = 17
∴ (x - 4)2 = 17
∴ x - 4 = ±√17
∴ x = 4 ± √17
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x=-1
x2+8x = -3x2+5 4x2+8x-5 = 0 (2x+5)(2x-1) = 0 x = -5/2 or x = 1/2
x2 + 8x - 9 = 0(x + 9) (x - 1) = 0(x + 9) = 0 . . . . . x = -9(x - 1) = 0 . . . . . x = 1
(4 ± i2) where i2 = -1
(x+ 7)(x + 1) so x = -1 or -7