Question

How to factorise it?

Answer 1

Answer:

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

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

[x^2+(y+z)^2][x^2-(y+z)^2]

[x^2+(y+z)^2][x-(y+z)][x+(y+z)]

[x^2(y+z)^2][x-y-z][x+y+z]