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= x² + 2x + 2x + 4
= x(x + 2) + 2(x + 2)
= (x + 2)(x + 2)
= (x + 2)²
x² + 4x + 4 = 0
(x + 2)² = 0
x + 2 = 0
x = -2
= x² + 2x + 2x + 4
= x(x + 2) + 2(x + 2)
= (x + 2)(x + 2)
= (x + 2)²