To solve this problem you must apply the proccedure shown below:
1. You have the following expresssion given in the problem above: b^24a^2−4ab+b^2+a−b^2a−b
2. Therefore, you must factor the common terms to simplify the expression above, as following:
ba(b^23-b-4)+b(b-1)+a
Then, as you can see, the answer is: ba(b^23-b-4)+b(b-1)+a