A contour plot for

z

$=$

f

$($

x

$,$

y

$)$

is illustrated.

Using the graph, determine the location of all extreme and saddle points.

Enter various values for

x

and

y

to move the red dot to test your estimates. You can view your estimate on the $3$D surface by checking the $3$D box.

Maxima:

Minima:

Saddle Points:

Restart the Interactive Cell

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x

$=$

y

$=$

Show $3$D surface? Problems with $3$D Graph? zoomin