Need help ASAP: intervals where f(x) = (0.25x-4)(5x+25)(x-12) has pos, neg rate of ch

[Hydrogen]

Determine the intervals on which the function f(x) = (0.25x-4)(5x+25)(x-12)
a) Where positive rate of change
a) Where negative rate of change

 

[Deleted member 4993]

Determine the intervals on which the function f(x) = (0.25x-4)(5x+25)(x-12)
a) Where positive rate of change
a) Where negative rate of change

What are your thoughts?

Please share your work with us ...even if you know it is wrong.

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/announcement.php?f=33

 

[Hydrogen]

Im entirely lost on how to start the question

 

[stapel]

Determine the intervals on which the function f(x) = (0.25x-4)(5x+25)(x-12)
a) Where positive rate of change
a) Where negative rate of change

Hint: What is the relationship between slope, derivative, and rate of change? Try applying this in the way they demonstrated in the examples in your book.