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Determine the zeros of the following quadratic functions by factoring.

1. \(y = 2x^2 - 14x + 24\)
   
   
   
2. \(f\left( x \right) = -3x^2 + 9x + 84\)
   
   
   
3. \(f\left( x \right) = 2x^2 - x - 3\)