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# Finding maxima and minima of a mathematical function

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Find the local maximum and minimum values and the saddle points of f(x,y) = 2xy + x-y.

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A function of two variables has a local maximum at (a,b)
<br>if f(x,y) =&lt; f(a,b) when (x,y) is near (a,b)
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<br>The number f(a,b) is called a local maximum value.
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<br>If f(x,y) &gt;= f(a,b) when (x,y) is near (a,b) then f(a,b) is a local minimum value. ...

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