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ERIC Number: EJ831441
Record Type: Journal
Publication Date: 2009-Mar
Pages: 4
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0025-5769
Tangent Lines without Derivatives for Quadratic and Cubic Equations
Carroll, William J.
Mathematics Teacher, v102 n7 p516-519 Mar 2009
In the quadratic equation, y = ax[superscript 2] + bx + c, the equation y = bx + c is identified as the equation of the line tangent to the parabola at its y-intercept. This is extended to give a convenient method of graphing tangent lines at any point on the graph of a quadratic or a cubic equation. (Contains 5 figures.)
National Council of Teachers of Mathematics. 1906 Association Drive, Reston, VA 20191-1502. Tel: 800-235-7566; Tel: 703-620-3702; Fax: 703-476-2970; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A