What is the critical f(x,y)=x^2-2xy+2y^2-2y ?

The critical f(x,y)=x^2-2xy+2y^2-2y is (1,1)

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

critical points

f (x, y) = x^{2} - 2 x y + 2 y^{2} - 2 y

(1, 1)

Solution steps

x^{2} - 2 x y + 2 y^{2} - 2 y

Find where

\nabla f (x, y)

is equal to zero or undefined

(1, 1)

f (x) = - 4 x^{4}

f (x) = 5 x^{3} + 8 x

f (x) = - x^{3} + 6 x^{2} + 63 x

h (t) = t^{\frac{3}{4}} - 6 t^{\frac{1}{4}}

f (x) = (x - 3) (x - 11)^{3}

What is the critical f(x,y)=x^2-2xy+2y^2-2y ?
The critical f(x,y)=x^2-2xy+2y^2-2y is (1,1)