Question

Let f be the function defined by f(x)=3x^5 - 5x^3 +2
(a) On what intervals is f increasing?
(b) On what intervals is the graph of f concave upward?
(c) Write the equation of each horizontal tangent line to the graph of f.

Answer 1

1st derivative test?

Answer 2

do first derivative test?

Answer 3

@Goten77 ok for first derivative i got 15x^4 - 15x^2

Answer 4

k thats right now factor it