Hi,
Work:
Equation;
![(5x - 30)(5x)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/wf7ucy813r8cc8on3e0eemn2akb1kguovg.png)
1. Remove unnecessary parenthesis.
![(5x - 30) * 5x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ys79i8tb98dn423k69u4hbqbo6f2x8g5gv.png)
2. Multiply each term in the parenthesis by 5x. This is called distribution trough parenthesis.
![5x * 5x - 30 * 5x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/2b7kgapdk7rvb39jk12e2mgaf7rsxzh7gd.png)
3. Calculate the products.
![25 {x}^(2) - 150x \: \: \: \: \: \: \: \: \: \: \: (result)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/9zsi0zrywbyhtvp1p3k8itvas8t8eanyzl.png)
Hope this helps.
If you have any questions about the answer please comment below. Thank you!
r3t40