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16 Jun 2023, 03:00
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72% (01:45) correct
28%
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Which of the following are roots of an equation \((x^{-2})+(2x^{-1})-15=0\)?
A. 1/5 and -1/3
B. -1/5 and 1/3
C. 1/5 and 1/3
D. -1/5 and -1/3
E. -5/2 and -1/3
A. 1/5 and -1/3
B. -1/5 and 1/3
C. 1/5 and 1/3
D. -1/5 and -1/3
E. -5/2 and -1/3
Mukulkumar19
GMAT Focus 1: 705 Q84 V89 DI82 (Online) 
Posts: 50
16 Jun 2023, 05:29
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To solve this let's assume x^-1 = a, hence x^-2 becomes a^2 now solve for a. We will get -5 and 3 as solution. Put it in our assumption and the answer will be -1/5 and 1/3 hence B.
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18 Oct 2024, 01:11
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After we get -5 and 3 as our solution, do we substitute this back into the original equation?
Mukulkumar19
