4 parts following these instructions
Find the critical numbers for f and the open intervals on whichf is increasing (decreasing)
For the first question, your answer should be a comma-separatedlist of x values or the word \"none\". For the other two, your answershould either be a single interval, such as (0,1), acomma-separated list of intervals, such as (-inf, 2), (3,4), or theword \"none\".
answeres needed for each part
| 1.  | The critical numbers for f are | |
| 2.  | f is increasing on the intervals | |
| 3.  | f is decreasing on the intervals |
part 1)
Let f(x)=18+3x−x^2
part 2)
let f(x)= 5+2x-x^3
part 3)
let f(x)=6x-6
part 4)
let f(x)= 6x^2-8x^4
