Answer
$(y+\frac{2}{3})(y^2-\frac{2y}{3}+\frac{4}{9})$
Work Step by Step
$y^3+\frac{8}{27}=y^3+(\frac{2}{3})^3=(y-\frac{2}{3})[y^2+y(\frac{2}{3})+(\frac{2}{3})^2]=(y+\frac{2}{3})(y^2-\frac{2y}{3}+\frac{4}{9})$
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