Let $\displaystyle{ f(x) = {\frac{1}{x^{2}}}}$

1. Find the first and second derivatives.
   • $f'(x) =$
   • $f''(x) =$
2. Identify the graph that displays $f$ in blue and $f''$ in red.
   
   
   
   
   
   
   
3. Using the graphs of $f$ and $f''$, indicate where $f$ is concave up and concave down. Give your answer as a list of intervals separated by commas. If there are no such intervals, enter “None”. interval
   • $f$ is concave up on
   • $f$ is concave down on