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x(x + 1) (x + 2) + x(x + 3) =
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x(x + 1) (x + 2) + x(x + 3)= (x2 + x)(x + 2) + (x2 + 3x)= (x3 + 2x2 + x2 + 2x) +(x2 + 3x)= x3 + 4x2 + 5x
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