what

you have to factoise it

thrs ntg common bt

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what

you have to factoise it

thrs ntg common bt

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⇒(x^4)^2-(y^4)^2

⇒(x^4+y^4)(x^4-y^4)

⇒(x^4+y^4)[(x^2)^2-(y^2)^2]

⇒(x^4+y^4)(x^2+y^2)(x^2-y^2)

⇒(x^4+y^4)(x^2+y^2)(x+y)(x-y)