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Question

Multiply:

(2) (a2 − ab + b2) (a + b)

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Solution

(a2 − ab + b2) (a + b)
= (a2 − ab + b2) a + (a2 − ab + b2)b
= (a2 × a) − (ab × a) + (b2 × a) + (a2 × b) − (ab × b) + (b2 × b)
= a3 − a2b + ab2 + a2b − ab2 + b3
= a3 + (−a2b + a2b) + (ab2 − ab2) + b3
= a3 + 0 + 0 + b3
= a3 + b3

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