Finding the Implicit Partial Derivative (∂y/∂x)z for x3 + y3 + z3 - 3xyz = 6

unscientific
Messages
1,728
Reaction score
13

Homework Statement



x3 + y3 + z3 - 3xyz = 6

Find (∂y/∂x)z.

Homework Equations





3. The Attempt at a Solution [/

can i simply take the partial derivative of both sides treating z as constant?

x3 + y3 + z3 - 3xyz - 6 = 0

f(x,y,z) = 0

(∂f/∂x)z = 0
 
Physics news on Phys.org
Yes.
 
That z is to be held constant and y thought of as a function of x only is precisely what that subscript "z" means.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
Back
Top