- #1
LiveLowGrow
- 8
- 0
Good Day,
My professor historically has put more advanced questions on the final exams than can be found in our textbook. My supplements and extensive search engine use have not allowed me to get any further...Ive hunted through as many examples as I could find but cannot seem to find a guiding light when it comes to this huge polynomial.. this is as far as I've gotten and my exam is in 18 hours... any help would be appreciated.
Classify the critical points of f(x,y)=x^3+y^3+x^2+y^2-2x-3y
I get my first order derivatives of Fx=3x^2-2 and Fy=3y^2+2y-3
..then I complete the squares to get roots of x=(sqrt7)/3 - 1/3 and x= - (sqrt7)/3 - 1/3
similarily I get y=(sqrt10)/3 - 1/3 and y= - (sqrt10)/3 - 1/3
D=FxxFyy-(Fxy)^2 gives me
(6x+2)(6y+2)-0
=36xy+12x+12y+4
and this is where I get lost...any help would be appreciated...
My professor historically has put more advanced questions on the final exams than can be found in our textbook. My supplements and extensive search engine use have not allowed me to get any further...Ive hunted through as many examples as I could find but cannot seem to find a guiding light when it comes to this huge polynomial.. this is as far as I've gotten and my exam is in 18 hours... any help would be appreciated.
Classify the critical points of f(x,y)=x^3+y^3+x^2+y^2-2x-3y
I get my first order derivatives of Fx=3x^2-2 and Fy=3y^2+2y-3
..then I complete the squares to get roots of x=(sqrt7)/3 - 1/3 and x= - (sqrt7)/3 - 1/3
similarily I get y=(sqrt10)/3 - 1/3 and y= - (sqrt10)/3 - 1/3
D=FxxFyy-(Fxy)^2 gives me
(6x+2)(6y+2)-0
=36xy+12x+12y+4
and this is where I get lost...any help would be appreciated...