Question

f(x,y) = x/y = y/x find fxx, fxy, and fyy

Answer 1

so do partial with respect to x and y first

Answer 2

I'll check with my answer

Answer 3

fx = y^-1 - 2yx^-2 = 1/y - 2y/x^2
fxx = -2y/x^3

Answer 4

then I am stuck with fxy

Answer 5

take Fx with respect to "y" so "x" is constant

Answer 6

-1/y^2 + 1/x^2

Answer 7

2y =2 and that looks good

Answer 8

thanks

Answer 9

no problem sorry I can't help with the extrema problem

Answer 10

that's ok thanks again