Question 1081906
{{{(x+2y)^3=x^3+6x^2y+12xy^2+8y^3}}}
So then,
{{{(x+2y)^3-16y^3=x^3+6x^2y+12xy^2+8y^3-16y^3}}}
{{{(x+2y)^3-16y^3=x^3+6x^2y+12xy^2-8y^3}}}
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{{{highlight(x^3+6x^2y+12xy^2-8y^3=(x+2y)^3-16y^3)}}}