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Article #251

Graph-TI - Graph Intersection points

#251
From: JONESL
Date: Fri, 28 Oct 1994 01:19
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I am using a Calculus Text titled Elements of Calculus and Analytic
Geometry by Thomas and Finney, published by Addison-Wesley,  c 1989.  On
page 100, problem 34, the problem states " A line is drawn tangent to the
curve y=x^3-x at the point (-1,0).  Where else does the line intersect
the curve?"  I decided to use my TI-82 calculator to assist in solving
this problem.  I entered y1 = x^3-x and after taking the derivative by
hand and subbing in x=-1 to get a slope of 2 for the tangent line, I
entered y2 = 2x+2.  I graphed both y1 and y2 using zoom 6.  Then 2nd Calc
5 to determine intersection points.  I find the point (2,6) as an
intersection point, but try as I may, I cannot get (-1,0), the original
tangent line point, as an intersection point using 2nd Calc 5.  What am I
doing wrong?
		Thanks, Larry Jones
				jonesl@calvin.duq.edu
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Newsgroups: bit.listserv.graph-ti
Date: Thu, 27 Oct 1994 21:19:11 -0400 (EDT)
From: JONESL@calvin.cc.duq.edu
Subject: Graph-TI - Graph Intersection points
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