Hi guys, I would really appreciate your help with this question.

Determine the max velocity of f(x)=-125(x^2-15x)/x+1

And can this value be found by setting the first derivative of v(t) egual to o(a(t)=o) and solving for t?

I think that the answer for the second question is yes, I just do not know how to solve it.

Here is the first derivative, v(t) -125(x-3)(x+5)/(x+1)^2

And here is the 2nd derivative, a(t) - 4000/(x)^3

ALL THE HELP WOULD BE GREATLY APPRECIATED!!!

THX IN ADVANCE!!!