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Question

Multiply:

(8) (ab + a2b + ab2) (a + b)

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Solution

(ab + a2b + ab2) (a + b)
=(ab + a2b + ab2)a + (ab + a2b + ab2)b
= (ab × a) + (a2b × a) + (ab2 × a) + (ab × b) + (a2b × b) + (ab2 × b)
= a2b + a3b + a2b2 + ab2 + a2b2 + ab3
= a2b + a3b + (a2b2 + a2b2) + ab2 + ab3
= a2b + a3b + 2a2b2 + ab2 + ab3

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