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# What is the value of 3x^2 + 2x – 1 ?

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Math Expert
Joined: 02 Sep 2009
Posts: 43866
What is the value of 3x^2 + 2x – 1 ? [#permalink]

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17 Sep 2017, 02:53
00:00

Difficulty:

55% (hard)

Question Stats:

66% (01:15) correct 34% (01:23) wrong based on 35 sessions

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What is the value of 3x^2 + 2x – 1 ?

(1) (x + 1)(3x + 1) = 0
(2) (x + 1)^2 = 0
[Reveal] Spoiler: OA

_________________
Senior Manager
Joined: 02 Jul 2017
Posts: 288
GMAT 1: 730 Q50 V38
Re: What is the value of 3x^2 + 2x – 1 ? [#permalink]

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17 Sep 2017, 03:04
Find : $$3x^2 + 2x – 1$$ =?

(1) (x + 1)(3x + 1) = 0
=> either x+1 = 0 or 3x+1 =0 => $$x= -1$$ or $$x= -1/3$$
Insufficient

(2) $$(x + 1)^2$$ = 0
=> x+1 = => $$x=-1$$

By putting value of x in equation => $$3x^2 + 2x – 1 = 3(-1)^2+2(-1)-1 = 3-2-1 =0$$

Sufficient

Manager
Joined: 19 Jul 2017
Posts: 85
Location: India
Concentration: General Management, Strategy
GPA: 3.5
Re: What is the value of 3x^2 + 2x – 1 ? [#permalink]

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17 Sep 2017, 06:27
Bunuel wrote:
What is the value of 3x^2 + 2x – 1 ?

(1) (x + 1)(3x + 1) = 0
(2) (x + 1)^2 = 0

Stmnt 1 ==> (x+1)(3x+1)=0 implies x=-1 or x=-1/3 . 2 values of x gives 2 different ans. soo insufficient

Stmnt2 ==> x+1^2=0 implies x=-1 . So 3-2-1=0 . Sufficient.

Ans:B
Re: What is the value of 3x^2 + 2x – 1 ?   [#permalink] 17 Sep 2017, 06:27
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