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Question

Factorize :
a6+27b3

A
(a23b)(a43a2b+9b2)
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B
(a2+3b)(a43a2b+9b2)
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C
(a2+3b)(a4a2b+9b2)
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D
(a2+3b)(a4a2b9b2)
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Solution

The correct option is B (a2+3b)(a43a2b+9b2)
a6+27b3
=(a2)3+(3b)3
Using [a3+b3=(a+b)(a2ab+b2)], we get
=(a2+3b)((a2)2(a2)3b+(3b)2)
=(a2+3b)(a43a2b+9b2)

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