Question

f(x,y)=4x^2y + 4ln(xy)
evaluate partial derivative of y at (x,y)=(1,2)

Answer 1

i got 16
wrong

Answer 2

i got the partial derivative of y as
8xy + 4/y

Answer 3

It should be 8x^2 + 4/y because the 8x^2 is treated as a constant and doesn't change.

Answer 4

ooops. I meant 4x^2

Answer 5

oooo i get what you are saying
thx!