Work Step by Step
$$(x+5)(x^2-5x+25)$$ $$=(x\times x^2)+(x\times (-5x))+(x\times25)+(5\times x^2)+(5\times (-5x))+(5\times25)$$ $$=x63-5x^2+25x+5x^2-25x+125$$ $$=x^3+125$$
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