Solving for intervals of concave up and concave down

[angela107]

Homework Statement:

Given $f(x) = 3x^5 − 5x^3$, what are the intervals of concave up and concave down?

Relevant Equations:

n/a

Is this correct?

 

[fresh_42]

Homework Statement:: Given $f(x) = 3x^5 − 5x^3$, what are the intervals of concave up and concave down?
Relevant Equations:: n/a


Is this correct?

Yes.