Factorise x^4+x^2y^2+y^4

Cbse Class 9th math factorisation 

Solution: Given x⁴+x²y²+y⁴

=x⁴+2x²y²+y⁴-x²y²

=(x²+y²)²-x²y²

=(x²+y²)²-(xy)²

=(x²+y²+xy)(x²+y²-xy)