SOLUTION: If f(x,y)=x^2-4xy+y^3+4y, the sum fxx +fyy is given by? A) 2-6y B)0 C)2x+4 D)-4(x+y), E)none of the above

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson  -> Lesson -> SOLUTION: If f(x,y)=x^2-4xy+y^3+4y, the sum fxx +fyy is given by? A) 2-6y B)0 C)2x+4 D)-4(x+y), E)none of the above      Log On


   

Question 254887: If f(x,y)=x^2-4xy+y^3+4y, the sum fxx +fyy is given by?
A) 2-6y B)0 C)2x+4 D)-4(x+y), E)none of the above
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
fx=2x-4y
fxx=2
fy=-4x%2B3y%5E2%2B4
fyy=6y
fxx%2Bfyy=2%2B6y
E) None of the above