Question

分解因式：x^2-y^2+2yz-z^2

Answer 1

x^2-y^2+2yz-z^2
=x^2-(y^2-2yz+z^2)
=x^2-(y-z)^2
=(x+y-z)(x-y+z)

Answer 2

x^2-y^2+2yz-z^2
→x^2-(y^2-2yz+z^2)
→x^2-(y-z)^2
→（x+y-z）(x-y+z)
不懂，请追问，祝愉快O(∩_∩)O~