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= (x + 4) (x + 4) (x + 4)
= x² + 4x + 4x + 16 (x + 4)
= x² + 8x + 16 (x + 4)
= x³ + 4x² + 8x² + 32x + 16x + 64
= x³ + 12x² + 48x + 64