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in Factorization by (64.6k points)

Factorize each of the following expressions:

xy9 – yx9

1 Answer

+1 vote
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Best answer

As given that,

xy9 – yx9

= -xy (x8 – y8)

= -xy [(x4)2 – (y4)2]

= -xy (x4 + y4) (x4 – y4)

= -xy (x4 + y4) (x2 + y2) (x2 – y2)

By using the formula (a2 – b2) = (a-b) (a+b)

= -xy (x4 + y4) (x2 + y2) (x + y) (x – y)

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