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The difference between a number and its reciprocal is 3.  What are the possible values of the number?

 Sep 23, 2020
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The difference between a number and its reciprocal is 3. What are the possible values of the number?

 

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\(a-\frac{1}{a}=3\\ \frac{a^2-1}{a}=3\\ a^2-1=3a\\ a^2-3a-1=0\)

\(a=1.5\pm\sqrt{1.5^2+1}\)

\({\color{blue}a_1}=1.5+1.803=\color{blue}3.303\\ {\color{blue}\frac{1}{a_1}}=\color{blue}0.303 \)

\({\color{blue}a_2}=1.5-1.803=\color{blue}-0.303\\ {\color{blue}\frac{1}{a_2}}=\color{blue}-3.303\)

laugh  !

 

 

 

 

laugh  !

 Sep 23, 2020
edited by asinus  Sep 23, 2020
edited by asinus  Sep 23, 2020

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