Consider the functionf(x)=12x^5+45x^480x^3+2.

f(x)has inflection points at (reading from left to right)x=D,E, andF

whereDis__________

andEis___________

andFis____________

For each of the following intervals, tell whetherf(x)is concave up or concave down.

(,D):Select an answer

Concave Up

Concave Down

(D,E):Select an answer

Concave Up

Concave Down

(E,F):Select an answer

Concave Up

Concave Down

(F,):Select an answer

Concave Up

Concave Down