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(x)² + 2(x)(3) + (3)² = x(x+3) + 3(x+3)
x² + 6x + 9 = x² + 3x + 3x + 9
x² + 6x + 9 =x² + 6x + 9
= x² + 3x + 3x + 9
= x² + 6x + 9