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

The extreme f(x,y)=5-2x+4y-x^2-4y^2 is Maximum(-1, 1/2)

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

extreme points

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

Maximum (- 1, \frac{1}{2})

Solution steps

Find the critical points:

(- 1, \frac{1}{2})

\frac{\partial ^{2} f}{\partial x ^{2}} = - 8

D (x, y) = 16

Check the sign of at each critical point

Check critical point

(- 1, \frac{1}{2}) :

Maximum

Maximum (- 1, \frac{1}{2})

f (x, y) = x^{3} - 3 x^{2} + y^{2}

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

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

f (x) = 2 x^{3} - 10 x^{2} - 16

q (x, z) = 3 x + 9 x z

What is the extreme f(x,y)=5-2x+4y-x^2-4y^2 ?
The extreme f(x,y)=5-2x+4y-x^2-4y^2 is Maximum(-1, 1/2)