22. The function $f$ is given by $f ( x ) = x ^ { 4 } + x ^ { 2 } - 2$. On which of the following intervals is $f$ increasing?\\
(A) $\left( - \frac { 1 } { \sqrt { 2 } } , \infty \right)$\\
(B) $\left( - \frac { 1 } { \sqrt { 2 } } , \frac { 1 } { \sqrt { 2 } } \right)$\\
(C) $( 0 , \infty )$\\
(D) $( - \infty , 0 )$\\
(E) $\left( - \infty , - \frac { 1 } { \sqrt { 2 } } \right)$\\
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