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Unformatted text preview: 2. f xx &gt; 0 f yy &gt; 0 Must hold simultaneously. You may have to substitute ( x c , y c ) into f xx and f yy to obtain their values. 2. f xx &lt; 0 f yy &gt; 0 OR f xx &gt; 0 f yy &lt; 0 Must hold simultaneously. You may have to substitute ( x c , y c ) into f xx and f yy to obtain their values. 2. f xx &gt; 0 f yy &gt; 0 OR f xx &lt; 0 f yy &lt; 0 Must hold simultaneously. You may have to substitute ( x c , y c ) into f xx and f yy to obtain their values. 3. f xx *f yy &gt; (f xy ) 2 3 . f xx *f yy &gt; (f xy ) 2 3. f xx *f yy &lt; (f xy ) 2 3. f xx *f yy &lt; (f xy ) 2 STEP 1 identifies any critical point(s). STEP 2 and STEP 3 tell you the nature of the critical point(s)....
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 Spring '11
 MikaelSandberg

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