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Simple maths question

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GMAT? Senior | Next Rank: 100 Posts Default Avatar
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Simple maths question

Post Wed Dec 20, 2006 12:19 pm
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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aim-wsc Legendary Member
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Post Thu Dec 21, 2006 6:56 pm
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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800guy Master | Next Rank: 500 Posts Default Avatar
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Post Thu Dec 21, 2006 3:38 pm
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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