Question

factorise
HELP THIS IS REALLY IMPORTANT​

Answer 1

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Answer 2

Answer:

[(x-y)(x+y)-5xy][(x-y)(x+y)+5xy]

Step-by-step explanation:

x^4+y^4-27xy

=(x^2)^2+(y^2)^2 -2x^2y^2-25x^2y^2

=(x^2-y^2)^2-(5xy)^2

=(x^2-y^2-5xy)(x^2-y^2+5xy)

=[(x-y)(x+y)-5xy][(x-y)(x+y)+5xy]