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

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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

Source: Beat The GMAT — Problem Solving | Thu Jun 24, 2021 10:24 am

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