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Question

Factorise a+2b+a3+8b3


A

(a+2b)(a22ab+b21)

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B

(a+2b)(a22ab+b2+1)

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C

(a+2b)(a22ab+b2)

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D

(a+2b)(a22ab+b2+2)

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Solution

The correct option is B

(a+2b)(a22ab+b2+1)


Given
a+2b+a3+8b3

a+2b+(a)3+(2b)3

(a+2b)+(a+2b)(a22ab+b2) (Using(a3+b3)
Taking a+2b common ,we have
(a+2b)(a22ab+b2+1)


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