Question

Find the directional derivative of z=f(x,y)= 2^1/2(x2 + xy), if f(x,y)=(1,4).

Answer 1

start by computing the gradient first.

Answer 2

That means, find the partial derivative with respect to x and with respect to y.

Answer 3

ok, thanks for the hint :)

Answer 4

Fa sho. If you need more help ask, man.