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## Simple maths question

This topic has 2 member replies
GMAT? Senior | Next Rank: 100 Posts
Joined
29 Sep 2006
Posted:
46 messages

#### Simple maths question

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.

aim-wsc Legendary Member
Joined
20 Apr 2006
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Target GMAT Score:
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Thu Dec 21, 2006 6:56 pm
i can understand how frustrating it could get when one sees the answer

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

_________________
Getting started @BTG?

Please do not PM me, (not active anymore) contact Eric.

800guy Master | Next Rank: 500 Posts
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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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