Question

find local extrema
f(x,y) - x^3-3xy^2 + 6y^2

Answer 1

first derivative set it equal to zero

Answer 2

sorry

Answer 3

I haven't learned minima and extrema for 3d functions

Answer 4

OK that's fine thanks

Answer 5

did you look at the other one

Answer 6

take the respective partial derivatives of the function, and set them to zero. SImilar to a standard maxima question, just using partial differentiation.