It's just a square

The stupidest way to expand.

If you don't use inflation,

1. the square difference formula makes m = a-b n = a+b.

2. the square difference formula makes m = a+b+cn = a+b-c.

3. Expand hard, otherwise it is the skill of breaking things, which is boring.

In the end, it will probably become the square of (a+b) minus the cube of (a-b) and so on.

Then apply the previous method12.

4. let m = the square of x and n = the square of y.