Hi, Previously Posted

f(x, y) = x^2 + 2xy + 2y^2 -6y + 2

∂ f/∂ x = 2x + 2y

∂ f/∂ y = 4y + 2x - 6

 2x + 2y = 0

 2x + 4y = 6

    2y = 6

     y = 3   and x = -3

 = 2

 = 2

 = 4

D =  

f(x,y) has minimum at (-3,3) 

f(-3, 3) = 9 -18 +18 -18 + 2 = - 7 

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