Question

find (x^2 - y^2) (x^2 + y^2)

Answer 1

(x² -y²)(x² +y²)
(x4 -y4)

I hope you understand

Answer 2

=> (x²-y²) (x²+y²)
=> x⁴+xy²-xy²-y⁴
after cancelling xy² and xy²,
=> x⁴-y⁴

Hope it will help you !!

Good Day !!