Use the function f $($x$)=2$x$^4-36$x$^2-7$ to complete all parts of this question.

Round your answers to two decimal places.

$($a$)$ This function has $3$ critical numbers $($CNs$)$ which are:

CN$1$ is x$=\_\_($smallest$)$

CN$2$ is x$=\_\_($middle$)$

CN$3$ is x$=\_\_($largest$)$

$($b$)$ Find the abolute maximum and minimum values of f$($x$)$ on the interval $-5$