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Question

If |a|=3, |b|=4 and |a+b|=1, then |a-b|=

A
5
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B
6
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C
7
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D
8
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Solution

The correct option is C 7
|a+b|2+|ab|2=2|a|2+2|b|21+|ab|2=2(3)2+2(4)2|ab|2=49|ab|=7

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