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# What is the value of 5x^2+4x-1? (1) x(x+2)=0 (2) x=0

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VP
Joined: 21 Jul 2006
Posts: 1491
What is the value of 5x^2+4x-1? (1) x(x+2)=0 (2) x=0 [#permalink]

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18 Aug 2008, 06:51
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What is the value of $$5x^2+4x-1?$$

(1) $$x(x+2)=0$$

(2) $$x=0$$

It's either i'm loosing it or this problem is simply that tricky. I chose B as my answer, but the OA is D??? how? what makes statement 1 suff.? In statement 1, I got 2 values for x which are 0 and -2. When you plug the different values of x into the question, you will get 2 different answers. So how is statement 1 suff.? Could this be a typo?
SVP
Joined: 30 Apr 2008
Posts: 1850
Location: Oklahoma City
Schools: Hard Knocks
Re: DS: What is the value? [#permalink]

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18 Aug 2008, 06:59
It doesn't make sense to me either. I tried to find x(x+2) within the equation given, and then plug in 0 for that, but wasn't able to find it. Maybe you can see where x(x+2) can be pulled out from $$5x^2+4x-1$$.

I broke down $$5x^2+4x-1$$ to $$(5x-1)(x+1)=0$$ but that didn't really help at all.

What's the source of this problem?

tarek99 wrote:
What is the value of $$5x^2+4x-1?$$

(1) $$x(x+2)=0$$

(2) $$x=0$$

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**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a.

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VP
Joined: 21 Jul 2006
Posts: 1491
Re: DS: What is the value? [#permalink]

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18 Aug 2008, 07:51
The source is Gmatprep, but I got this pdf file that has like 20 problems from the Gmatprep, where this problem is one of them. I'm just not sure whether this pdf file has copied the answer correctly. So i'm not even sure how correct is the OA because it was compiled by someone else.

regards,
Re: DS: What is the value?   [#permalink] 18 Aug 2008, 07:51
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# What is the value of 5x^2+4x-1? (1) x(x+2)=0 (2) x=0

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