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og ds 97

by resilient » Sat Feb 09, 2008 12:23 am
what is the value of 5^2 +4x-1?

1.) x(x=2)=0
2. x=0

this sounds like an elementary question but why didnt I see -2 as a solution to the statement 1. I only saw 0.
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by its_me07 » Mon Feb 11, 2008 1:39 am
From statement 1: x=0 or x-2=0 INSUFF
From statement 2: x=0 Suff
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Re: og ds 97

by Stuart@KaplanGMAT » Mon Feb 11, 2008 4:19 pm
Enginpasa1 wrote:what is the value of 5^2 +4x-1?

1.) x(x=2)=0
2. x=0

this sounds like an elementary question but why didnt I see -2 as a solution to the statement 1. I only saw 0.
Whenever the product of two terms is 0, one of the terms must be 0. For example, if x*y=0, then either x=0 or y=0.

Statement (1) is an example of a product of 0.

If x(x-2) = 0, then either x=0 or (x-2)=0. Therefore, x=0 or x=2.
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