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Simple maths question


 
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GMAT?
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PostPosted: Wed Dec 20, 2006 1:19 pm    Post subject: Simple maths question Reply with quote
DS question: What is the value of x?

1) x^2= 4x. I thought that from this statement x = 4. As x^2 = x.x. So x.x/x = 4. So x = 4. Why is this not right? The book says consider what if x = 0.

2) x is even. Well obviously doesnt give the answer.

Thanks all for ur help.
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800guy
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PostPosted: Thu Dec 21, 2006 4:38 pm    Post subject: Re: Simple maths question Reply with quote
GMAT? wrote:
DS question: What is the value of x?

1) x^2= 4x. I thought that from this statement x = 4. As x^2 = x.x. So x.x/x = 4. So x = 4. Why is this not right? The book says consider what if x = 0.

2) x is even. Well obviously doesnt give the answer.

Thanks all for ur help.


note: according to eric's flashcards, 0 is an even number

1) alone is not sufficient because x could equal 0 or 4

2) alone is not sufficient because x could equal 0 or 4

my guess is E
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aim-wsc
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PostPosted: Thu Dec 21, 2006 7:56 pm    Post subject: Reply with quote
i can understand how frustrating it could get when one sees the answer Laughing

remember. always consider zero, one, negative values and fractions (in power) while dealing with quant.
hope that helps everybody.
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