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Quadratic functions - Coggle Diagram

- - - - Two cut off points: (x1,0) and (x2,0) if b2-4ac > 0
      - One cut-off point: (x1,0) if b2-4ac = 0
      - No cut-off point: if b2-4ac < 0
  - - - D = (−∞, ∞)
  - - - If it's positive (concave up ∪, or a>0) then the range is: R = [k, ∞)
      - If it's negative (concave down ∩, or a<0) then the range is: R = (−∞, k]