(x+3)² = 81
resolviendo
x²+ 6x +9 = 81
x²+ 6x - 72 = 0
(x + 12)(x - 6) = 0
x1 = -12
x2 = 6
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(x+3)² = 81
resolviendo
x²+ 6x +9 = 81
x²+ 6x - 72 = 0
(x + 12)(x - 6) = 0
x1 = -12
x2 = 6