DS question

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gabriel
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Topic: DS question

Fri Nov 16, 2007 3:23 am

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What is the value of |x|?

(1) |x2 + 16| - 5 = 27

(2) x2 = 8x - 16

moneyman
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Fri Nov 16, 2007 3:39 am

Is the answr B?? _________________ Maxx

ri2007
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Fri Nov 16, 2007 6:16 am

The Ans should be D Statement 1) Gives two values of X^2, one is 16 and the other is -48. Since X^2 cannot be negative, the only solution is lXl = 4 Statement 2) Straightforward lXl = 4 Pls confirm if my thinking is correct. Thanks

gabriel
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Sat Nov 17, 2007 7:46 am

ri2007 wrote: The Ans should be D Statement 1) Gives two values of X^2, one is 16 and the other is -48. Since X^2 cannot be negative, the only solution is lXl = 4 Statement 2) Straightforward lXl = 4 Pls confirm if my thinking is correct. Thanks excellent .. that is the answer .. i posted the question because of the trap in the first choice, which many people tend to ignore