If $x^2+\dfrac9{x^2}=31,$ what is the value of $x-\dfrac3{x}?$

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members; Thanked: 6 times

by Vincen » Thu Jun 24, 2021 10:24 am

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If $x^2+\dfrac9{x^2}=31,$ what is the value of $x-\dfrac3{x}?$

A. 36
B. 25
C. 9
D. 5
E. 3

Answer: D

Source: GMAT Prep

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