Answer:

The Answer is all correct.

The First Thing was that..

On Numerator We Multiply it by -1 and -1

So there will be null effect

let's See how

Afterwards,

In Numerator You will Multiply -1 with b² + a²

So the Results will be

Then Arrange -b² and -a² according to Denominator

Hence -a² - b² will be Divided and tye results will be