The second problem is as follows: a (a-b) - B (a + b) =?

The second problem is as follows: a (a-b) - B (a + b) =?

4A quartic b-4aa square b square
Simplification: 4A square B (a square AB)
A-square-2ab-b-square
Simplify the square of (a-b)
I don't know if you want to work it out or simplify it, so I wrote it all down