1.

If \[{{x}^{2}}+\frac{1}{{{x}^{2}}}=79,\] what is the value of \[x+\frac{1}{x}\]?

A.  \[7\]      
B.  \[9\]        
C.  \[\sqrt{79}\]     
D.      \[-9\]
Answer» C.  \[\sqrt{79}\]     


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