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Formula use: \left(a+b\right)^3=a^3+3.a^2.b+3.a.b^2+b^3
Here, given expression is : xy+y
Find the cubes with the help of formula :
\left(xy+y\right)^3
\rightarrow\left(xy\right)^3+3.\left(xy\right)^2.y+3.xy.\left(y\right)^2+\left(y\right)^3
\rightarrow x^3y^3+3x^2y^3+3xy^3+y^3
Ans: x^3y^3+3x^2y^3+3xy^3+y^3.
