# Math Help - derivative

1. ## derivative

The function
${f{{\left({x}\right)}}}=-{4}{{x}}^{{3}}-{6.6}{{x}}^{{2}}+{219.2832}{x}-{7.51}$
is increasing on the interval (

,

).It is decreasing on the interval ( $-\infty$,

) and the interval (

, $\infty$ ).The function has a local maximum at

.

2. ## Re: derivative

you've posted an extensive list of individual problems showing no effort on your part whatsoever ... this is not a homework service.