Step 1 :The question is asking for the first partial derivatives of the function with respect to x and y. The partial derivative of a function with respect to a variable is the derivative of the function with respect to that variable, treating all other variables as constants.
Step 2 :For \(f_{x}(x, y)\), we will differentiate \(f(x, y)\) with respect to x, treating y as a constant.
Step 3 :For \(f_{y}(x, y)\), we will differentiate \(f(x, y)\) with respect to y, treating x as a constant.
Step 4 :The first partial derivative of the function with respect to x is \(f_{x}(x, y)=5x^{4}-3y\).
Step 5 :The first partial derivative of the function with respect to y is \(f_{y}(x, y)=-3x-16y\).
Step 6 :Final Answer: The first partial derivatives of the function are: \(\boxed{f_{x}(x, y)=5x^{4}-3y}\) and \(\boxed{f_{y}(x, y)=-3x-16y}\).