1. ## derivative

how do you find the derivative of the following

A = 2(pi r^2 + k/r)

Note: k is a constant

2. Originally Posted by darkknight100
how do you find the derivative of the following

A = 2(pi r^2 + k/r)

Note: k is a constant
if you don't know the rules for basic derivatives, then you should not have been assigned this problem ...

http://www.mathhelpforum.com/math-he...-question.html

3. Originally Posted by darkknight100
how do you find the derivative of the following

A = 2(pi r^2 + k/r)

Note: k is a constant
Use the rule that if y = ax^n then dy/dx = na x^(n-1).

Note that $\frac{2k}{r} = 2k r^{-1}$ ....