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15 Jan 2026, 22:00
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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:
15%
(low)
Question Stats:
81% (01:07) correct
20%
(01:32)
wrong
based on 200
sessions
History
Date
Time
Result
Not Attempted Yet
If (10 – 6a)^5 = –1, a = ?
A. –3 / 2
B. –11 / 6
C. 3 / 2
D. 5 / 3
E. 11 / 6
A. –3 / 2
B. –11 / 6
C. 3 / 2
D. 5 / 3
E. 11 / 6
15 Jan 2026, 23:08
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The correct option should be Option E 11 / 6, and here's why:
Given:
(10-6a)^5 = -1
Think logically - when can this be true? This can be true only when 10-6a = -1
as (-1)^5 = -1
-6a = -1-10
-6a = -11
Thus, a = 11/6 (Option E) is the correct answer.
Given:
(10-6a)^5 = -1
Think logically - when can this be true? This can be true only when 10-6a = -1
as (-1)^5 = -1
-6a = -1-10
-6a = -11
Thus, a = 11/6 (Option E) is the correct answer.
16 Jan 2026, 00:57
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the easiest way would be to use the choices to get to ans.
even in choices we can reject few immediately.
to get -1 as an ans, (-6a) should be greater than 10.
so option a and b can be rejected instantly as they would make the equation positive.
same goes for C as well.
D will get to 0
so only E would get to ans.
even in choices we can reject few immediately.
to get -1 as an ans, (-6a) should be greater than 10.
so option a and b can be rejected instantly as they would make the equation positive.
same goes for C as well.
D will get to 0
so only E would get to ans.
ExpertsGlobal5
