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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: a+5
Find the cubes with the help of formula :
\left(a+5\right)^3
\rightarrow a^3+3.a^2.5+3.a.\left(5\right)^2+\left(5\right)^3
\rightarrow a^3+15a^2+75a+125
Ans: a^3+15a^2+75a+125\ .
