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Question

If (x2+1x2)=66, then (x1x) is equal to

A
6
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B
12
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C
8
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D
9
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Solution

The correct option is A 8
(x1x)2=x2+1x22×x×1x
=x2+1x22
(x1x)2=662=64
(x1x)=8
Option C is correct.

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