Question 358795
{{{x^3+y^3=(x^2-xy+y^2)(x+y)}}}
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{{{(x+y)^2=x^2+2xy+y^2}}}
{{{(x+y)^2=(x^2+y^2)+2(xy)}}}
{{{(x+y)^2=(2)+2(-1)}}}
{{{(x+y)^2=0}}}
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{{{x^3+y^3=(x^2-xy+y^2)(x+y)}}}
{{{x^3+y^3=(x^2+y^2-xy)(x+y)}}}
{{{x^3+y^3=(2+1)(0)}}}
{{{highlight(x^3+y^3=0)}}}