. Find (that is, use the definition to find the partial derivative at (1,3)).
The answer has to be .
My Attempt:
I want to use the following definition to find the partial derivative
So,
If I cancel out in the denominator with the the term on top I get:
which is wrong... can anoyne help?
Where did the '64' come from? f(1, 3)= 2(1)(9)+ 2(3)+ 4(1)= 18+ 6+ 4= 28.
And does "from the definition" really mean using the difference quotient? By the time you get to partial derivatives, you usually use the definition that Prove It refers to- that the partial derivative of f with respect to x is just the ordinary derivative holding other variables constant.
No, this should beSo,
[/quote]
If I cancel out in the denominator with the the term on top I get:
which is wrong... can anoyne help?[/QUOTE]