Quadratic equations

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Across
  1. 7. when the discriminant is negative
  2. 12. process of getting a perfect square
  3. 13. the shape of the graph of a quadratic equation
  4. 15. numbers that are multiplied by a variable
  5. 17. a^2 - b^2
  6. 18. number of solutions if b^2 - 4ac > 0
  7. 19. b^2 - 4ac
  8. 20. number of solutions if b^2 - 4ac = 0
Down
  1. 1. if the product of 2 numbers is 0, either one or both of the numbers is 0.
  2. 2. quadratic expression where 'a' is not 1
  3. 3. have the exact same pronumerals
  4. 4. used to find the solutions to ANY quadratic equation
  5. 5. ax^2 +bx + c = 0
  6. 6. (a+b)^2
  7. 8. factorising four term expressions by
  8. 9. the opposite of expanding
  9. 10. Can you factorise all quadratic expressions?
  10. 11. ax^2 +bx + c = 0
  11. 14. can not change in the equation
  12. 16. number of solutions if b^2 - 4ac < 0