Question: Let z = (x, y) = 6x 2 - 4xy + 9y 2 . Find the following using the formal definition of the partial derivative.

Let z = ƒ(x, y) = 6x2 - 4xy + 9y2. Find the following using the formal definition of the partial derivative.

(a) ∂z/∂x

(b) ∂z/∂y

(c) ∂f/∂x(2, 3)

(d) ƒy (1, -2)

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