Re: problem sets

Posted by X on Aug 21, 2013; 4:17am
URL: http://discussion-forum.276.s1.nabble.com/problem-sets-tp7583841p7583850.html

According to Wikipedia,"In calculus, a critical point of a function of a real variable is any value in the domain where either the function is not differentiable or its derivative is 0."

So, f(x)=x(x-10)(x-20)(x-30)=x^4-60x^3+1100x^2-6000x
and it is differentiable everywhere w.r.t. x. and df/dx=x^3-45x^2+550x-1500 and to find out critical point, we have to find x such that df/dx=0.

now Akshay, can you solve df/dx=0 for x?

or any trick do you know to find critical point?

PLEASE HELP!!