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What is the value of a? (1) a^2 + a – 12 = 0 (2) |a| > 2

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What is the value of a? (1) a^2 + a – 12 = 0 (2) |a| > 2  [#permalink]

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New post Updated on: 01 Feb 2019, 04:10
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A
B
C
D
E

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  5% (low)

Question Stats:

86% (00:57) correct 14% (01:10) wrong based on 88 sessions

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What is the value of a?

(1) a^2 + a – 12 = 0

(2) |a| > 2



Why is it not C?

Originally posted by DebbieChats on 01 Feb 2019, 04:05.
Last edited by Bunuel on 01 Feb 2019, 04:10, edited 1 time in total.
Renamed the topic and edited the question.
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Re: What is the value of a? (1) a^2 + a – 12 = 0 (2) |a| > 2  [#permalink]

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New post 01 Feb 2019, 04:12
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Re: What is the value of a? (1) a^2 + a – 12 = 0 (2) |a| > 2  [#permalink]

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New post 01 Feb 2019, 04:20
(1)+(2) Both a = -4 and a = 3 satisfy |a| > 2, so we cannot find the single numerical value of a. Not sufficient.

1+2
a< -2 and a=-4 ...so a is -4? (C) wrong logic?
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New post 01 Feb 2019, 04:25
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Re: What is the value of a? (1) a^2 + a – 12 = 0 (2) |a| > 2  [#permalink]

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New post 01 Feb 2019, 08:34
DebbieChats wrote:
What is the value of a?

(1) a^2 + a – 12 = 0

(2) |a| > 2



Why is it not C?


(1) Factoring gives (a+4) (a-3) = 0 so a=-4 or a=3

NS

(2) |a| >2 --> a>2 or a<-2 NS

(1) and (2) a=-4 or a =3 and a <-2 or a>2 NS E
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Re: What is the value of a? (1) a^2 + a – 12 = 0 (2) |a| > 2  [#permalink]

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New post 02 Feb 2019, 01:30
DebbieChats wrote:
What is the value of a?

(1) a^2 + a – 12 = 0

(2) |a| > 2



Why is it not C?



#1
a can be -4 or +3
not sufficient
#2
lal>2 not sufficient
from 1& 2
a can be any value -4 or 3
not sufficient
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Re: What is the value of a? (1) a^2 + a – 12 = 0 (2) |a| > 2   [#permalink] 02 Feb 2019, 01:30
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