$(x^2-y)(x^4 +x^2y + y^2) $
Work Step by Step
$x^6 + y^3 = (x^2)^3 - y^3 =(x^2-y)((x^2)^2 +x^2y + y^2) = (x^2-y)(x^4 +x^2y + y^2) $
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