$18$:$34126$

Score: $3\mathrm{.}04/14$ Answered: $2/14$

Question $5$

Let $f(x)=\frac{x^4-50x^2}{11}$

$($a$)$ Use the definition of a derivative or the derivative rules to find $f^{\text{'}}(x)=$

$($b$)$ Use the definition of a derivative or the derivative rules to find $f^{\text{'}\text{'}}(x)=$

$($c$)$ On what interval is $f$ increasing?

interval: $$

$($d$)$ On what interval is $f$ decreasing?

interval: $$

$($e$)$ On what interval is $f$ concave downward?

interval: $$

$($f$)$ On what interval is $f$ concave upward?

interval: $$

Question Help: $$ Message instructor