Salamat, Lorina G., College Algebra, National Book Store 1988 pg. 151 – 159.

Coronel, Iluminada C. F.M.M, Mathematics 3 An Integrated Approach, Bookmark Inc.

1991 pg. 77 – 79, 134 – 158.

Coronel, Iluminada C. F.M.M, Mathematics 4 An Integrated Approach, Bookmark Inc.

1992 pg. 276 – 297.

Borwein, P. and Erdélyi, T. "Quadratic Equations." §1.1.E.1a in Polynomials and

Polynomial Inequalities. New York: Springer-Verlag, p. 4, 1995.

URL – Images

01. http://www.mathwarehouse.com/algebra/complex-number/absolute-value-

complex-number.php

02. http://commons.wikimedia.org/wiki/File:Quadratic_equation_coefficients.png

03. http://mathworld.wolfram.com/PolynomialRoots.html

04. http://www.livephysics.com/shop/tools-and-gadgets.html