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

#### Explanation

*Here,* given expression is : 5x-2y *Now, *Find the cubes of :

\left(5x-2y\right)^3

\rightarrow\left(5x\right)^3-3.\left(5x\right)^2.2y+3.5x.\left(2y\right)^2-\left(2y\right)^3

\rightarrow 125x^3-3.25x^2.2y+3.5x.4y^2-8y^3

\therefore 125x^3-150x^2y+60xy^2-8y^3 **Ans:** 125x^3-150x^2y+60xy^2-8y^3\ .