x2 + 6x + 12 = 0
x2 + 6x + 9 = -3
(x + 3)2 = -3
x + 3 = ± √-3
x = -3 ± i√3
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It has roots x = 2.618 and x = 0.38197
30 - 12 = 18
x2 + 6x + 9 = 81 x2 + 6x = 72 x2 + 6x - 72 = 0 (x+12)(x-6) = 0 x= -12, 6 (two solutions)
9x + 8 = 6x + 20(- 8 from both sides)9x = 6x + 12(- 6x from both sides)3x = 12(divide both sides by 3)x = 4
6x + 2 = 14 The solution: 6x + 2 = 14 6x +2 - 2 = 14 - 2 6x = 12 6x / 6 = 12 / 6 x = 2