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Good inequality...

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amit.trivedi@ymail.com GMAT Destroyer!
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Good inequality... Post Mon May 07, 2012 1:30 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    "If x is negative, is x < -3 ?

    (1) x^2 > 9
    (2) x^3 < -9 "


    I donot have the OA but when I solved the question, I got the answer as E. Is it correct? Could any of the experts please help?

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    GmatKiss GMAT Titan Default Avatar
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    Post Mon May 07, 2012 1:56 am
    imo: D

    mathbyvemuri Really wants to Beat The GMAT! Default Avatar
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    Post Mon May 07, 2012 1:59 am
    statement(1): x^2 > 9 => x < -3 or x > 3
    There is ambiguity here and hence, (1) alone is not sufficient

    statement(2): x^3 < -9 => x < -2.something
    There is ambiguity again as it is asked whether x < -3. Hence, (2) alone is not sufficient

    But if we consider both the statements together, the common possible solution is: x < -3, which is sufficient and hence option "C"

    aneesh.kg GMAT Destroyer!
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    Post Mon May 07, 2012 2:15 am
    Guys,
    the answer is (A).

    You can read it here:
    http://www.beatthegmat.com/good-inequality-t111524.html#470202

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    Bill@VeritasPrep GMAT Instructor
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    Post Mon May 07, 2012 8:32 am
    mathbyvemuri wrote:
    statement(1): x^2 > 9 => x < -3 or x > 3
    There is ambiguity here and hence, (1) alone is not sufficient

    statement(2): x^3 < -9 => x < -2.something
    There is ambiguity again as it is asked whether x < -3. Hence, (2) alone is not sufficient

    But if we consider both the statements together, the common possible solution is: x < -3, which is sufficient and hence option "C"
    Statement 1 works because the stem specifically mentions that x must be negative.

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    zueswoods Rising GMAT Star Default Avatar
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    Post Mon May 07, 2012 9:07 am
    I believe the answer is A

    The if you draw the graphs you will get the solutions, also, remeber the question stem says X < 0 so X>3 is not an option.

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