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Posts: 38
Updated on: 01 Feb 2019, 03:10
Originally posted by DebbieChats on 01 Feb 2019, 03:05.
Last edited by Bunuel on 01 Feb 2019, 03:10, edited 1 time in total.
Last edited by Bunuel on 01 Feb 2019, 03:10, edited 1 time in total.
Renamed the topic and edited the question.
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Difficulty:
5%
(low)
Question Stats:
82% (00:56) correct
18%
(00:51)
wrong
based on 224
sessions
History
Date
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What is the value of a?
(1) a^2 + a – 12 = 0
(2) |a| > 2
(1) a^2 + a – 12 = 0
(2) |a| > 2
Why is it not C?
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
What is the value of a?
(1) a^2 + a – 12 = 0 --> a = -4 or a = 3. Not sufficient.
(2) |a| > 2 --> a < -2 or a > 2. Not sufficient.
(1)+(2) Both a = -4 and a = 3 satisfy |a| > 2, so we cannot find the single numerical value of a. Not sufficient.
Answer: E.
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(1) a^2 + a – 12 = 0 --> a = -4 or a = 3. Not sufficient.
(2) |a| > 2 --> a < -2 or a > 2. Not sufficient.
(1)+(2) Both a = -4 and a = 3 satisfy |a| > 2, so we cannot find the single numerical value of a. Not sufficient.
Answer: E.
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Posts: 38
(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?
1+2
a< -2 and a=-4 ...so a is -4? (C) wrong logic?
DebbieChats
We don't have that a < -2. We have that |a| > 2, which means that a < -2 OR a > 2. Again, BOTH value from (1), a = -4 and a = 3, satisfy |a| > 2.
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DebbieChats
(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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DebbieChats
#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
IMOE
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