Question

(a^2-b^2)(a^2+b^2)-(a^2-b^2)^2​

Answer 1

(a^2-b^2)[(a^2+b^2) - (a^2-b^2)]

= (a^2-b^2)[(a^2+b^2-a^2+b^2]

=(a^2-b^2)2b^2

=2b^2(a^2-b^2)