Question

Factorise x3 – y3 – 9xy – 27.

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

x - y = 3

x = y + 3

x3−y3−9xy

Substitute y+ 3 for x

(y+3)3−y3−9(y+3)y

y3+9y2+27y+27−y3−27y−9y2

= 27

Step-by-step explanation:

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