(a-2b)3 এর মান কত ?

A a3 + 8b3 - 6a2b - 12ab2

B a3 - 8b3 - 6a2b - 12ab2

C a3 - 8b3 - 6a2b + 12ab2

D a3 - 8b3 - 12a2b - 6ab2

Solution

Correct Answer: Option C

(a-2b)3 
= a3 - 3.a2.2b + 3.a.(2b)2 - (2b)
= a3 - 6a2b + 12ab2 - 8b3 
= a3 - 8b3 - 6a2b + 12ab2 

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