find the product of : (x+1) (x2+3x-4)
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= x(x²+3x-4)+1(x²+3x-4)
= x³+3x²-4x+x²+3x-4
= x³+x²+3x²+3x-4x-4
= x²(x+1)+3x(x+1)-4(x+1)
= (x²+3x-4) (x+1)
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