Question

factorise x power 4 - y power 4

Answer 1

solution

= x^4 - y ^4

= (x^2)^2 - (y^2)^2

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

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

* Identity used= A^2 - B^2 = (A+B) (A - B)

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