Determine the Largest Interval on Which the Function $f ( x ) = x + \frac { 1 } { x }$

Determine the largest interval on which the function $f ( x ) = x + \frac { 1 } { x }$ concave upward?

A) $( - 1,0 )$

B) $( - \infty , - 1 )$
C) $( - \infty , 0 )$
D) $( 0 , \infty )$
E) $( 1 , \infty )$
F) $( 0,1 )$

G) $\left( 0 , \frac { 1 } { 2 } \right)$

H) $\left( - \frac { 1 } { 2 } , 0 \right)$

Correct Answer:

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