Question

因式分解(x²-y²）²-8（x²+y²）+16

Answer 1

(x²-y²）²-8（x²+y²）+16=(x²+y²）²-8（x²+y²）+16-4x²y²=（x²+y²-4）²-4x²y²=（x²+y²-4+2xy）（x²+y²...