What is the extreme f(x,y)=-2x^2-2y^2-4xy+5x+4y ?

The extreme f(x,y)=-2x^2-2y^2-4xy+5x+4y is None

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extreme f(x,y)=-2x^2-2y^2-4xy+5x+4y

extreme points

f (x, y) = - 2 x^{2} - 2 y^{2} - 4 x y + 5 x + 4 y

None

Solution steps

Find the critical points:

None

- 2 x^{2} - 2 y^{2} - 4 x y + 5 x + 4 y

has no critical points, therefore there are no extreme points

None

f (x) = 2 x^{3} - 9 x^{2} - 12 x - 1

f (x) = x^{3} (x + 4)

f (x, z) = x^{3} + z^{3} - 3 x - 3 z

f (x) = \frac{1}{3} x^{3} - x^{2} - 3 x + 5

f (x, y) = x^{3} + y^{3} - 27 x y

What is the extreme f(x,y)=-2x^2-2y^2-4xy+5x+4y ?
The extreme f(x,y)=-2x^2-2y^2-4xy+5x+4y is None