Determine the signs of the partial derivatives for the function f whose graph is shown below.

7.Determine the signs of the partial derivatives for the function f whose graph is shown below.

Determine the signs of the partial derivatives for the function f whose graph is shown below. 1

(a) fxx(−x0, y0)

positive negative

(b) fyy(−x0, y0)

positive negative

8. Determine the signs of the partial derivatives for the function f whose graph is shown below.

Determine the signs of the partial derivatives for the function f whose graph is shown below. 2

(a) fx(−x0, y0)

positive negative

(b) fy(−x0, y0)

positive negative

9. Determine the signs of the partial derivatives for the function f whose graph is shown below.

Determine the signs of the partial derivatives for the function f whose graph is shown below. 3

(a) fx(x0, y0)

positive negative

(b) fy(x0, y0)

positive negative

10. Determine the signs of the partial derivatives for the function f whose graph is shown below.

Determine the signs of the partial derivatives for the function f whose graph is shown below. 4

(a) fxy(x0, y0)

positive negative

(b) fxy(−x0, y0)

positive negative