Choiceboard algebra baddie

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Across
  1. 2. tells us whether there are two solutions, one solution, or no solutions.
  2. 5. is a plane curve which is mirror-symmetrical and is approximately U-shaped.
  3. 8. formed by changing the sign between two terms in a binomial.
  4. 10. The _ of a polynomial f(x) are values of x which satisfy the equation f(x) = 0.
Down
  1. 1. a factor of a number that, when multiplied by itself, gives the original number.
  2. 3. The difference between the lowest and highest values.
  3. 4. Highest y-value.
  4. 6. Lowest y-value.
  5. 7. The highest or lowest point of a parabola.
  6. 9. The _ of a function is the set of its possible inputs.