### Finding Extreme Values for Functions of Two Variables

1.)f(x,y)= 2x^2 + xy^2 + 5x^2 + y^2 2.)f(x,y)= ysquareroot x - y^2 - x + 6y.

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1.)f(x,y)= 2x^2 + xy^2 + 5x^2 + y^2 2.)f(x,y)= ysquareroot x - y^2 - x + 6y.

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