Question

a square + b square minus A square + b square

Answer 1

I think you want ask (a^2+b^2)-(a^2+b^2)=a^2+b^2-a^2-b^2=0 ans.


And if it is capital A in place of a then,it will be a^2-A^2.

Answer 2

(a^2+b^2) - (a^2+b^2)
a^2+b^2-a^2-b^2
They cancel each other
=0
I think there is some misstate in the question itself