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Question

Factorise a327b3+2a2b6ab2

A
(a+3b)[(a3b)2(a2+9b2+3ab)+2ab]
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B
=(a3b)[(a3b)2(a2+9b2+3ab)+2ab]
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C
(a3b)[(a+3b)2(a2+9b2+3ab)+2ab]
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D
(a3b)[(a3b)2(a29b2+3ab)2ab]
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Solution

The correct option is B =(a3b)[(a3b)2(a2+9b2+3ab)+2ab]
a327b3+2a2b6ab2
=a3(3b)3+2a2b6ab2
{ a3b3=(ab)(a2+ab+b2) }
=(a3b)[a2+9b2+3ab)]+2ab(a3b)
=(a3b)[a2+9b2+5ab]

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