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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 : 2x+7y
Find the cubes with the help of formula :
\left(2x+7y\right)^3
\rightarrow\left(2x\right)^3+3.\left(2x\right)^2.7y+3.2x.\left(7y\right)^2+\left(7y\right)^3 [use formula]
\rightarrow{8x}^3+84x^2y+294xy^2+343y^3
Ans: {8x}^3+84x^2y+294xy^2+343y^3\ .
