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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 : m+3n
Find the cubes with the help of formula :
\left(m+3n\right)^3
\rightarrow m^3+3.m^2.3n+3.m.\left(3n\right)^2+\left(3n\right)^3
\rightarrow m^3+{9m}^2n+{27mn}^2+{27n}^3
Ans: m^3+{9m}^2n+{27mn}^2+{27n}^3\ .
