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

https://www.webassign.net/scalcet/14-3-6.gif

(a) fx(−x0, y0)

positive negative

(b) fyy(−x0, y0)

positive negative

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

https://www.webassign.net/scalcet/14-3-6.gif

(a) fx(−x0, y0)

positive negative

(b) fy(−x0, y0)

positive negative

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

https://www.webassign.net/scalcet/14-3-5.gif

(a) fx(x0, y0)

positive negative

(b) fy(x0, y0)

positive negative

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

https://www.webassign.net/scalcet/14-3-8.gif

(a) fxy(x0, y0)

positive negative

(b) fxy(−x0, y0)

positive negative