Posted by
**mkcolema** on
.

6.

f(x)= 12x^5 + 30x^4 - 160x^3 +4

For this function there are four important intervals:(-inf, A] ,

[A,B] ,[B,C],[C, inf) where A ,B ,C are the critical numbers.

Find A B AND C and at those points do they have a local min, max or neither??