Math Puzzle

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Across
  1. 3. The nonnegative root
  2. 8. Method used to remove a square root
  3. 10. Part of a complex number with i
  4. 12. Third power of a number
  5. 15. Number with real and imaginary parts
  6. 16. Numbers involving √(-1)
  7. 17. Number formed by flipping the sign of the imaginary part
  8. 18. To get the variable alone
  9. 19. Number that tells which root to take
  10. 21. Part of a complex number without i
  11. 22. Angle of a complex number in polar form
Down
  1. 1. Polynomial of degree 2
  2. 2. Reduce to simplest form
  3. 4. Set of allowable input values
  4. 5. Second power of a number
  5. 6. Distance of a complex number from the origin
  6. 7. The number inside a radical sign
  7. 8. Form a + bi
  8. 9. A false solution introduced during solving
  9. 11. Symbol used to represent a root
  10. 12. Step to confirm the solution is valid
  11. 13. Two expressions with the same value
  12. 14. Form using r and θ
  13. 20. Mathematical sentence with an equal sign
  14. 21. Value that satisfies x² = a