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Question

If a2+b2=10 and ab=3, then find a−b.

A
2
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B
4
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C
6
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D
10
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Solution

The correct option is A 2

Formula (ab)2=a2+b22ab
Given, a2+b2=10 and ab=3
So, (ab)2=a2+b22ab=102×3=106=4

=>ab=4=2

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