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14 Aug 2017, 06:18
Kudos
Bookmarks
B
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:
49% (00:50) correct
51%
(01:03)
wrong
based on 111
sessions
History
Date
Time
Result
Not Attempted Yet
Is x = 5?
(1) \(x^2-5x=0\)
(2) \(2x^2+10x=0\)
(1) \(x^2-5x=0\)
(2) \(2x^2+10x=0\)
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
14 Aug 2017, 06:43
Kudos
Bookmarks
From A x = 0 or x = 5 not sufficient
From B x = 0 or x = -5
So sufficient B.
From B x = 0 or x = -5
So sufficient B.
14 Aug 2017, 07:37
Kudos
Bookmarks
Bunuel
Is x=5?
(1) \(x^2-5x=0\) --> \(x(x-5)=0\) --> \(x=0\) OR \(x=5\). Not sufficient, to answer whether \(x=5\).
(2) \(2x^2+10x=0\) --> \(x(x+5)=0\) --> \(x=0\) OR \(x=-5\). Here we know that \(x\neq{5}\), hence sufficient.
Answer: B.
