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Question

Using an identity, find the value of
12.127.92.

A
80
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B
84
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C
88
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D
86
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Solution

The correct option is B 84
Using the identity,
a2b2=(ab)(a+b)

12.127.92
=(12.1+7.9)(12.17.9)=20.0×4.2=84.0=84

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