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Question

Factorise

(xy)3+(yz)3+(zx)3 [3 MARKS]

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Solution

Formula: 1 Mark
Application: 2 Marks

Let (xy)=a,(yz)=b,(zx)=c

a+b+c=(xy)+(yz)+(zx)=0

a+b+c=0a3+b3+c3=3abc

(xy)3+(yz)3+(zx)3=3(xy)(yz)(zx)


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