Question

(a²-b²)² - (a²+b²)² =?​

Answer 1

Answer:

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

=(a^4+b^4-2a^2b^2 )-(a^4+b^4+2a^2b^2)

=a^4+b^4-2a^2b^2-a^4-b^4-2a^2b^2

= -4a^2b^2