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Verified answer
3x³ + 48x + 189= 3(x³ + 16x + 63)
3x² + 48x +189
= 3(x² + 16x +63)
= 3(x² + 7x + 9x + 63)
= 3(x + 7)(x + 9)
= (3x + 21)(x + 9)