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15 Oct 2019, 23:07
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
65% (01:13) correct
35%
(01:06)
wrong
based on 34
sessions
History
Date
Time
Result
Not Attempted Yet
If x ≠ 0, is x equal to -1?
(1) x^5 = x
(2) x^2 = -x
(1) x^5 = x
(2) x^2 = -x
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
firas92
Current Student
Joined: 16 Jan 2019
Last visit: 24 Jul 2026
Posts: 616
Given Kudos: 142
Location: India
Concentration: General Management
Schools: Tepper '23 (M$) Foster '23 (D)
GMAT 1: 740 Q50 V40
WE:Sales (Other)
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15 Oct 2019, 23:37
Kudos
Bookmarks
Bunuel
(1) x^5 = x
This equation holds true for both x=1 and x=-1
1 is insufficient
(2) x^2 = -x
x^2+x=0
x(x+1)=0
So either x=0 or x=-1 but we are told that x ≠ 0
Therefore x=-1
2 is sufficient
Answer is (B)
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