Question

Determine the sign of fx and fy at each indicated point using the contour diagram of f shown below. (The point P is that in the first quadrant, at a positive x and y value; Q through T are located clockwise from P, so that Q is at a positive x value and negative y, etc.)

Answer 1

what did i do wrong?

Answer 2

at point Q, both are increasing,
both fx and fy are positive..

Answer 3

you've got em opposite.
at R, fx is positive
fy is -ve

Answer 4

what do you think about point S?

Answer 5

negative and negative？

Answer 6

good

Answer 7

it still says 50%

Answer 8

check again

Answer 9

i will post

Answer 10

@electrokid

Answer 11

at R, make fy positive

Answer 12

if i made the change, it reduced the point 50%to 30%

Answer 13

haha.
Q: fx>0, fy>0
R: fx>0, fy<0
S: fx>0, fy>0

Answer 14

so S is both pos
?

Answer 15

yes