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(x + 2)(x + 8) = 0
x = - 2 atau x = -8
x² + 10x = - 16
(x + 5)² = - 16 + 5²
(x + 5)² = 9
x + 5 = 3 atau x + 5 = - 3
x = - 2 atau x = - 8