Hello,Originally Posted bydiudiu

as I understand your text right, you want some information about:

I've attached a diagram of this function.

The domain is a subset of the real numbers which are allowed with your function. There are a few restrictions, which you have to consider:

1. Division by zero is forbidden.

2. Squareroot of a negative number is not a real number.

3. Logarithms of zero or negative numbers are not real.

Your fuction doesn't deal with all these restrictions . Thus the domain of your function is

What bothers me a little bit is: Why do you believe that the domain is

The derivative of your function is (Don't forget to use the chain rule!):

=

You'll get an extreme value (maximum or minimum) of this function if the derivative equals zero:

Multiply by the denominator and afterwards square both sides of the equation. You'll get:

E(57.735) = 285.0085

Greetings

EB