DS question

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gabriel
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Topic: DS question
PostFri Nov 16, 2007 2:23 am Reply with quote
What is the value of |x|?

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

(2) x2 = 8x - 16
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moneyman
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PostFri Nov 16, 2007 2:39 am Reply with quote
Is the answr B??
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ri2007
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PostFri Nov 16, 2007 5:16 am Reply with quote
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
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gabriel
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PostSat Nov 17, 2007 6:46 am Reply with quote
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
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