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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 : pq+rs
Find the cubes with the help of formula :
\left(pq+rs\right)^3
\rightarrow\left(pq\right)^3+3.\left(pq\right)^2.rs+3.pq.\left(rs\right)^2+\left(rs\right)^3
\rightarrow p^3q^3+3p^2q^2rs+3pqr^2s^2+r^3s^3
Ans: p^3q^3+3p^2q^2rs+3pqr^2s^2+r^3s^3\ .
