Tham khảo Phương_trình_bậc_hai

  1. ↑ Protters & Morrey: " Calculus and Analytic Geometry. First Course"
  2. 1 2 3 Washington, Allyn J. (2000). Basic Technical Mathematics with Calculus, Seventh Edition. Addison Wesley Longman, Inc. ISBN 0-201-35666-X. 
  3. ↑ Ebbinghaus, Heinz-Dieter; Ewing, John H. (1991), Numbers, Graduate Texts in Mathematics 123, Springer, tr. 77, ISBN 9780387974972 .
  4. ↑ Sterling, Mary Jane (2010), Algebra I For Dummies, Wiley Publishing, tr. 219, ISBN 978-0-470-55964-2 
  5. ↑ Rich, Barnett; Schmidt, Philip (2004), Schaum's Outline of Theory and Problems of Elementary Algebra, The McGraw-Hill Companies, ISBN 0-07-141083-X , Chapter 13 §4.4, p. 291
  6. ↑ Himonas, Alex. Calculus for Business and Social Sciences, p. 64 (Richard Dennis Publications, 2001).
  7. ↑ Kahan, Willian (20 tháng 11 năm 2004), On the Cost of Floating-Point Computation Without Extra-Precise Arithmetic (PDF), truy cập ngày 25 tháng 12 năm 2012 
  8. ↑ Alenit͡syn, Aleksandr and Butikov, Evgeniĭ. Concise Handbook of Mathematics and Physics, p. 38 (CRC Press 1997)
  9. ↑ Δ is the initial of the Greek word Διακρίνουσα, Diakrínousa, discriminant.
  10. ↑ Achatz, Thomas; Anderson, John G.; McKenzie, Kathleen (2005). Technical Shop Mathematics. Industrial Press. tr. 277. ISBN 0-8311-3086-5. 
  11. ↑ Wharton, P. (2006). Essentials of Edexcel Gcse Math/Higher. Lonsdale. tr. 63. ISBN 978-1-905-129-78-2. 
  12. ↑ Friberg, Jöran (2009). “A Geometric Algorithm with Solutions to Quadratic Equations in a Sumerian Juridical Document from Ur III Umma”. Cuneiform Digital Library Journal 3. 
  13. 1 2 Stillwell, John (2004). Mathematics and Its History (2nd ed.). Springer. ISBN 0-387-95336-1. 
  14. ↑ The Cambridge Ancient History Part 2 Early History of the Middle East. Cambridge University Press. 1971. tr. 530. ISBN 978-0-521-07791-0. 
  15. ↑ Henderson, David W. “Geometric Solutions of Quadratic and Cubic Equations”. Mathematics Department, Cornell University. Truy cập ngày 28 tháng 4 năm 2013. 
  16. 1 2 Aitken, Wayne. “A Chinese Classic: The Nine Chapters” (PDF). Mathematics Department, California State University. Truy cập ngày 28 tháng 4 năm 2013. 
  17. ↑ Smith, David Eugene (1958). History of Mathematics. Courier Dover Publications. tr. 380. ISBN 978-0-486-20430-7. 
  18. ↑ Smith, David Eugene (1958). History of Mathematics, Volume 1. Courier Dover Publications. tr. 134. ISBN 0-486-20429-4.  Extract of page 134
  19. 1 2 3 4 Katz, V. J.; Barton, B. (2006). “Stages in the History of Algebra with Implications for Teaching”. Educational Studies in Mathematics 66 (2): 185–201. doi:10.1007/s10649-006-9023-7. 
  20. 1 2 Boyer, Carl B.; Uta C. Merzbach, rev. editor (1991). A History of Mathematics. John Wiley & Sons, Inc. ISBN 0-471-54397-7. 
  21. ↑ O'Connor, John J.; Robertson, Edmund F., “Arabic mathematics: forgotten brilliance?”, Dữ liệu Lịch sử Toán học MacTutor, Đại học St. Andrews  "Algebra was a unifying theory which allowed rational numbers, irrational numbers, geometrical magnitudes, etc., to all be treated as "algebraic objects"."
  22. ↑ Jacques Sesiano, "Islamic mathematics", p. 148, in Selin, Helaine; D'Ambrosio, Ubiratan biên tập (2000), Mathematics Across Cultures: The History of Non-Western Mathematics, Springer, ISBN 1-4020-0260-2 
  23. ↑ Smith, David Eugene (1958). History of Mathematics. Courier Dover Publications. tr. 280. ISBN 978-0-486-20429-1. 
  24. ↑ Livio, Mario (2006). The Equation that Couldn't Be Solved. Simon & Schuster. ISBN 0743258215. 
  25. ↑ Ronan, Colin (1985). The Shorter Science and Civilisation in China. Cambridge University Press. tr. 15. ISBN 978-0-521-31536-4. 
  26. ↑ Struik, D. J.; Stevin, Simon (1958), The Principal Works of Simon Stevin, Mathematics (PDF) II–B, C. V. Swets & Zeitlinger, tr. 470 
  27. ↑ Heaton, H (1896). “A Method of Solving Quadratic Equations”. American Mathematical Monthly 3 (10): 236–237. JSTOR 2971099. doi:10.2307/2971099. 

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