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= 9x^2 + 24x + 16 + (4x -2)(x +1)
= 9x^2 + 24x + 16 + ( 4x^2 + 2x - 2)
= 9x^2 + 24x + 16 + 4x^2 + 2x - 2
= 13x^2 + 26x + 14