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What is the value of 5x^2 + 4x-1

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Senior Manager
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What is the value of 5x^2 + 4x-1 [#permalink] New post 01 Mar 2007, 00:39
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

75% (01:38) correct 25% (00:54) wrong based on 114 sessions
What is the value of 5x^2 + 4x-1

(1) x(x+2)=0
(2) x=0
[Reveal] Spoiler: OA

Last edited by Bunuel on 10 Mar 2012, 11:03, edited 2 times in total.
Edited the question
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 [#permalink] New post 01 Mar 2007, 00:51
(B) for me :)

5*x^2+ 4x-1 = ?

From 1
x*(x+2) =0
<=> x=0 or x=-2

Let's plug the values to see if the result would be equal:
o If x=0, then 5*0 + 4*0 -1 = -1
o If x=-2, then 5*4 + 4*(-2) -1 = 20 - 9 = 11

INSUFF.

From 2
x=0

Clearly, we have : 5*0 + 4*0 -1 = -1

SUFF
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Re: What is the value of 5(x)2+ 4x-1 1) x(x+2)=0 2)x=0 [#permalink] New post 10 Mar 2012, 09:57
1. x(x+2)=0 <=> x=0 or x=-2 Insuff (We need only one value for x)
2. x=0 Clearly sufficient. Replace x with 0 and you have the value.

Answer: B
Re: What is the value of 5(x)2+ 4x-1 1) x(x+2)=0 2)x=0   [#permalink] 10 Mar 2012, 09:57
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