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x(x²+1)+ 3(x²+1)= (x+3)(x²+1)
x^3 +3x^2 + x + 3 = x^2(x + 3) + (x + 3) = (x + 3)(x^2 + 1)
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x(x²+1)+ 3(x²+1)= (x+3)(x²+1)
x^3 +3x^2 + x + 3 = x^2(x + 3) + (x + 3) = (x + 3)(x^2 + 1)