i) (x + 3) (x2 + 2x - 1)
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x (x^2 + 2x - 1) + 3 (x^2 + 2x - 1)
x^3 + 2x^2 - x + 3x^2 + 6x - 3
x^3 + 5x^2 + 5x - 3
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