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OG2015 DS What is the value

This topic has 1 expert reply and 0 member replies
lionsshare Senior | Next Rank: 100 Posts
Joined
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Posted:
62 messages

OG2015 DS What is the value

Post Sat Sep 16, 2017 2:11 am
What is the value of |x| ?

(1) x = - |x|
(2) x^2 = 4

OA: B

Please help, Experts, what's the best approach to solving this problem. Thanks!

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Top Reply
Post Sat Sep 16, 2017 5:16 am
lionsshare wrote:
What is the value of |x| ?

(1) x = - |x|
(2) x^2 = 4

OA: B

Please help, Experts, what's the best approach to solving this problem. Thanks!
Statement 1: x = -|x|

Since |x| is positive, we can deduce that x is a negative number; however, the value of x, thus |x| is interminable. Insufficient.

Statement 2: x^2 = 4

=> x = ±2

=> |x| = |±2| = 2. Sufficient.

The correct answer: B

Hope this helps!

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