What is the extreme S(x,y)=3x-2y+(3x-5y)-2x+[3y-(2x-7y)+4x] ?

The extreme S(x,y)=3x-2y+(3x-5y)-2x+[3y-(2x-7y)+4x] is None

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extreme S(x,y)=3x-2y+(3x-5y)-2x+[3y-(2x-7y)+4x]

extreme points

S (x, y) = 3 x - 2 y + (3 x - 5 y) - 2 x + [3 y - (2 x - 7 y) + 4 x]

None

Solution steps

Find the critical points:

None

3 x - 2 y + 3 x - 5 y - 2 x + [3 y - (2 x - 7 y) + 4 x]

has no critical points, therefore there are no extreme points

None

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

P (x, y) = m^{2} x m + 3 y m + 7 - m^{3} x m + 7 y m + 4 + m x m + 8 y m + 6

x^{2} - 5 a^{2}

f (x, y) = (x - y) (x y - 1)

f (x) = 3 x + y - 6

What is the extreme S(x,y)=3x-2y+(3x-5y)-2x+[3y-(2x-7y)+4x] ?
The extreme S(x,y)=3x-2y+(3x-5y)-2x+[3y-(2x-7y)+4x] is None