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Question

If |x|272|x|=1, then x can be

A
2
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B
3
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C
4
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D
5
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Solution

The correct option is D 5
|x|272|x|=1

Case 1: |x|272|x|=1
|x|2=72|x|
3|x|=9
|x|=3
x=3,3

Case 2: |x|272|x|=1
|x|2=7+2|x|
5=|x|
x=+5,5

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