For this case we have the following expression:
![3x ^ 3-9x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ky5uypsuo4qntv2z3ibaz8vvapa644s81a.png)
We must obtain a factored expression.
We look for the factors of 3 and 9:
3: 1.3
9: 1,3,9
Thus, the biggest factor that divides both numbers is 3.
It is noted that "x" is also a common factor of both terms of the expression.
Then, we can rewrite the expression as:
![3x (x ^ 2-3)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/287aeezo6417y6d3gm9jy6vpobrhm97qnm.png)
Answer:
![3x (x ^ 2-3)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/287aeezo6417y6d3gm9jy6vpobrhm97qnm.png)