Formula use: \left(a-b\right)^3=a^3-3a^2b+3ab^2-b^3

#### Explanation

*Here, *given expression is : 2x-3y *Now,* Find the cubes of :

\left(2x-3y\right)^3

\rightarrow\left(2x\right)^3-3.\left(2x\right)^2.3y+3.2x.\left(3y\right)^2-\left(3y\right)^3

\therefore{8x}^3-36x^2y+54xy^2-27y^3 **Ans:** {8x}^3-36x^2y+54xy^2-27y^3\ .