Question

（x的平方+y的平方）的平方-4x的平方y的平方 因式分解

Answer 1

（x²+y²）²-4x²y²
=(x²+y²)²-(2xy)²
=(x²+y²-2xy)(x²+y²+2xy)
=(x-y)²(x+y)²

Answer 2

(x^2+y^2)^2-4x^2y^2
=(x^2+y^2)^2-(2xy)^2
=(x^2+y^2+2xy)(x^2+y^2-2xy)
=(x+y)^2(x-y)^2