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Question

If 3x12x=6, then the value of 9x2+14x2

A
36
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B
33
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C
30
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D
39
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Solution

The correct option is D 39
Given that 3x12x=6
Squaring both sides, we get
9x2+14x23=36
We know the identity a2+b22ab=(ab)2
9x2+14x2=39

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