Question

First question of 10
Factorise:

x^4-y^4+x^2-y^2






Answer-(x+y)(x-y)(x^2+y^2+1)

Answer 1

Answer:x⁴-y⁴+x²-y²

x⁴+x²-y⁴-y²

taking x² and y² common

x²(x²+1)-y²(y²+1)

(x²-y²)[(x²+1)(y²+1)]

(x-y)(x+y)+1(x²+y²+1)

(x-y)(x+y)(x²+y²+1)

i hope this helps you