(x + 1)(x2 + 3x - 4)=(x + 1)x2 + (x + 1)3x - (x + 1)4
=(x3 + x2) + (3x2 + 3x) - (4x + 4)
=x3 + 4x2 - x - 4

Enter this as x^3+4*x^2-x-4


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