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B
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Difficulty:
25%
(medium)
Question Stats:
64% (00:43) correct
36%
(00:45)
wrong
based on 1842
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of |x| ?
(1) x = –|x|
(2) x^2 = 4
(1) x = –|x|
(2) x^2 = 4
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25 May 2012, 00:55
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What is the value of |x| ?
(1) x = –|x|
\(|x|=-x\) implies that \(x\leq{0}\). Not sufficient.
(2) x^2 = 4
Taking the square root gives \(|x|=2\) (\(x=2\) or \(x=-2\) --> in either case \(|x|=2\)). Sufficient.
Answer: B.
Hope it's clear.
(1) x = –|x|
\(|x|=-x\) implies that \(x\leq{0}\). Not sufficient.
(2) x^2 = 4
Taking the square root gives \(|x|=2\) (\(x=2\) or \(x=-2\) --> in either case \(|x|=2\)). Sufficient.
Answer: B.
Hope it's clear.
General Discussion
31 May 2012, 11:06
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|x| ~ x^2 hence, its easy to solve
