Factorise -a-b3-8My attempt -a-b3-23-a-b-2a-b2-22-2a-bWhat should I do not-

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Identity (x+y)(x-y)

Factorise :a+...

Question

Factorise :

(a + b)³ - 8

My attempt

= (a + b)³- (2)³

= (a + b - 2) {(a + b)²+ (2)² + 2(a + b)}

What should I do not?

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Solution

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