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Formula use: \left(a-b\right)^3=a^3-3a^2b+3ab^2-b^3
Here, given expression is : pqr-2q
Now, Find the cubes of :
\left(pqr-2q\right)^3
\rightarrow\left(pqr\right)^3-3.\left(pqr\right)^2.2q+3.pqr.\left(2q\right)^2-\left(2q\right)^3
\rightarrow p^3q^3r^3-3.p^2q^2r^2.2q+3.pqr.4q^2-8q^3
\therefore p^3q^3r^3-6p^2q^3r^2+12pq^3r-8q^3
Ans: p^3q^3r^3-6p^2q^3r^2+12pq^3r-8q^3\ .
