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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
09 Aug 2017
Posted:
62 messages

OG2015 DS What is the value

Post Sat Sep 16, 2017 2:11 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    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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    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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