7 and 21 can cancel leaving a 3 on the bottom. one m can cancel from the bottom and the top so that leaves you with m^3 n^4/3
Answer: The required factored form of the given expression is

Step-by-step explanation: We are given to find the factored form of the following algebraic expression:

We will be using the following formula:

Now, we have

Thus, the required factored form of the given expression is
