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Australian AMC 2009 - Senior Question 8

AMC AUSTRALIA · Australian AMC 2009 - Senior

Question 8

The graph of $y=ax^2+bx+c$ is shown, with its vertex on the $y$-axis. Which of the following statements must be true?

Question illustration
  1. $a+b+c=0$
  2. $a+b-c<0$
  3. $-a+b-c>0$
  4. $a+b+c<0$
  5. there is not enough information