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Question

Find the value of (3a12)(3a12).

A

9a22a+14

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B

6a23a+14

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C

9a23a+14

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D

9a23a+12

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Solution

The correct option is C

9a23a+14


(3a12)(3a12)=(3a12)2

Using the identity
(ab)2=a22ab+b2,

(3a12)2=(3a)22×3a×12+(12)2=9a23a+14


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