The graph of the function y=a x^2+b x+c is shown in the diagram. Which of the following must be positive?
Answer Choices
A. a
B. bc
C. ab^2
D. b-c
E. c-a
The graph of the function y=a x^2+b x+c is shown in the diagram. Which of the following must be positive?
Answer Choices
A. a
B. bc
C. ab^2
D. b-c
E. c-a