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Quadratic or Not?

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  • 5t + 7 = 0
    Not Quadratic
  • 8k – 3 = 0
    Not Quadratic
  • 4x²+ 4x + 1 = 0
    Quadratic
  • r²+ 8r + 16 = 0
    Quadratic
  • 9 – 4x = 0
    Not Quadratic
  • r²- 16 = 0
    Quadratic
  • 2m²– 8m = 0
    Quadratic
  • 3s + 21 = 0
    Not Quadratic
  • x²– 2x – 3 = 0
    Quadratic
  • x²– 5x + 3 = 0
    Quadratic
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