Problem #8: The graph of z = f(x, y) is shown below. In each part, determine whether the given partial derivatives are positive, negative, or zero. (Note that the function is symmetric about 0 in both the x- and y- directions.) 15 10 5 0 -5 -10 202 20-2-4 (a) (-2,2) and fxx(-2, 2) (b) -2,2) and (-2,2) (e) (2,0) and (2,0) (d) fy(2,0) and yy (2,0) (A) negative, negative (B) negative, positive (C) positive, positive (D) zero, negative (E) negative, zero (F) zero, zero (G) positive, zero (H) zero, positive (I) positive, negative Problem #8(a): I (A) positive, zero (B) negative, negative (C) zero, zero (D) zero, negative (E) positive, negative (F) negative, positive (G) zero, positive (H) negative, zero (I) positive, positive Problem #8(b): I (A) zero, zero (B) negative, zero (C) zero, negative (D) positive, zero (E) positive, positive (F) negative, negative (G) positive, negative (H) negative, positive (I) zero, positive Problem #8(c): F (A) zero, negative (B) negative, positive (C) negative, zero (D) zero, positive (E) positive, negative (F) zero, zero (G) positive, positive (H) positive, zero (I) negative, negative Problem #8(d): G Just Save Your work has been saved! (Back to Admin Page). Submit Problem #8 for Grading Problem #8 Attempt #1 Attempt #2 Attempt #3 Your Answer: 8(a) I 8(a) 8(a) 8(b) F 8(b) 8(b) 8(c) F 8(c) 8(c) 8(d) G 8(d) 8(d) Your Mark: 8(a) 1/1 8(a) 8(a) 8(b) 0/1X 8(b) 8(b) 8(c) 1/1 8(c) 8(c) 8(d) 0/1X 8(d) 8(d)