Question 859910
{{{(x^2+y)^2=(x^2+y)(x^2+y)}}}
Use the FOIL method,
First: {{{x^2(x^2)=x^4}}}
Outer: {{{x^2y}}}
Inner: {{{yx^2}}}
Last: {{{y(y)=y^2}}}
{{{(x^2+y)^2=x^4+x^2y+x^2y+y^2}}}
{{{(x^2+y)^2=x^4+2x^2y+y^2}}}