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08 Mar 2020, 00:23
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
80% (00:25) correct
20%
(00:22)
wrong
based on 5
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of a?
(1) a^2 + a – 12 = 0
(2) |a| > 2
(1) a^2 + a – 12 = 0
(2) |a| > 2
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
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08 Mar 2020, 00:36
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Considering only option 1:
(1) a^2 + a – 12 = 0
By solving for 'a' we get (a+4)*(a-3)=0
That is: 'a' can take two values and not a unique value, with a = -4 or a = 3
NOT SUFFICIENT.
Considering only option 2:
(2) |a| > 2
Option 2 is clearly NOT SUFFICIENT as 'a' can take any value >2 or <-2.
Considering both options 1 and 2 together:
Both values from option 1: a= -4 and a= 3 stand true for option 2: |a| > 2
Hence, even after combining the two options, a unique value for 'a' cannot be be found.
Answer- Option E.
Hope this helps!
Appreciate your Kudos on this!
Posted from my mobile device
(1) a^2 + a – 12 = 0
By solving for 'a' we get (a+4)*(a-3)=0
That is: 'a' can take two values and not a unique value, with a = -4 or a = 3
NOT SUFFICIENT.
Considering only option 2:
(2) |a| > 2
Option 2 is clearly NOT SUFFICIENT as 'a' can take any value >2 or <-2.
Considering both options 1 and 2 together:
Both values from option 1: a= -4 and a= 3 stand true for option 2: |a| > 2
Hence, even after combining the two options, a unique value for 'a' cannot be be found.
Answer- Option E.
Hope this helps!
Appreciate your Kudos on this!
Posted from my mobile device
08 Mar 2020, 02:13
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770GMAT
What is the value of a?
(1) a^2 + a – 12 = 0
(2) |a| > 2
(1) a^2 + a – 12 = 0
(2) |a| > 2
Discussed here: what-is-the-value-of-a-1-a-2-a-12-0-2-a-287764.html Hope it helps.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
