Answer
$x^3-x^2-12x+32$
Work Step by Step
$(x+4)(x^2-5x+8)=\\=x(x^2-5x+8)+4(x^2-5x+8)\\=(x^3-5x^2+8x)+4x^2-20x+32\\=x^3-x^2-12x+32$
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