COLLEGE ALGEBRA
6th Edition
ISBN: 9780321920898
Author: Dugopolski
Publisher: PEARSON
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Chapter 7.1, Problem LC
For Individual or Group Explorations
Tangent Lines
A line tangent to a parabola must intersect the parabola at exactly one point, as shown in the accompanying figure. Of course, it is impossible to draw a graph that really looks like there is one point of intersection. However, if we find a tangent line algebraically, then we can he sure that it intersects only once.
a) Consider y = x2 and the point (3, 9). If y – 9 = m(x – 3) is tangent to the parabola at (3, 9), then the system
y = x2
y – 9 = m(x – 3)
must have exactly one solution. For what value of m docs the system have exactly one solution?
b) Graph the parabola and the tangent line found in part (a) on a graphing calculator and then use the intersect feature of the calculator to find the point of intersection.
c) There is another line that intersects y = x2 at (3, 9) and only at (3, 9). What is it? Why did it not appear in part (a)?
d) Use the same reasoning as used in part (a) to find the slope of the tangent line to y = x2 at (x1, y1).
e) Use the result of part (d) to find the equation of the tangent line to y = x2 at (–2.5, 6.25).
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Chapter 7 Solutions
COLLEGE ALGEBRA
Ch. 7.1 - True or False? Explain. A parabola with focus (0,...Ch. 7.1 - Prob. 2FTCh. 7.1 - Prob. 3FTCh. 7.1 - Prob. 4FTCh. 7.1 - Prob. 5FTCh. 7.1 - Prob. 6FTCh. 7.1 - Prob. 7FTCh. 7.1 - Prob. 8FTCh. 7.1 - Prob. 9FTCh. 7.1 - Prob. 10FT
Ch. 7.1 - Fill in the blank. A curve obtained by...Ch. 7.1 - Prob. 2ECh. 7.1 - Prob. 3ECh. 7.1 - Prob. 4ECh. 7.1 - Each of the following graphs shows a parabola...Ch. 7.1 - Prob. 6ECh. 7.1 - Prob. 7ECh. 7.1 - Prob. 8ECh. 7.1 - Each of the following graphs shows a parabola...Ch. 7.1 - Prob. 10ECh. 7.1 - Find the equation of the parabola with the given...Ch. 7.1 - Prob. 12ECh. 7.1 - Find the equation of the parabola with the given...Ch. 7.1 - Prob. 14ECh. 7.1 - Find the equation of the parabola with the given...Ch. 7.1 - Prob. 16ECh. 7.1 - Find the equation of the parabola with the given...Ch. 7.1 - Prob. 18ECh. 7.1 - Find the equation of the parabola with the given...Ch. 7.1 - Prob. 20ECh. 7.1 - Prob. 21ECh. 7.1 - Prob. 22ECh. 7.1 - Prob. 23ECh. 7.1 - Prob. 24ECh. 7.1 - Determine the vertex, focus, and directrix for...Ch. 7.1 - Prob. 26ECh. 7.1 - Prob. 27ECh. 7.1 - Prob. 28ECh. 7.1 - Determine the vertex, focus, and directrix for...Ch. 7.1 - Prob. 30ECh. 7.1 - Prob. 31ECh. 7.1 - Prob. 32ECh. 7.1 - Prob. 33ECh. 7.1 - Prob. 34ECh. 7.1 - Prob. 35ECh. 7.1 - Prob. 36ECh. 7.1 - Prob. 37ECh. 7.1 - Prob. 38ECh. 7.1 - Prob. 39ECh. 7.1 - Prob. 40ECh. 7.1 - Find the vertex, focus, and directrix of each...Ch. 7.1 - Prob. 42ECh. 7.1 - Prob. 43ECh. 7.1 - Prob. 44ECh. 7.1 - Prob. 45ECh. 7.1 - Prob. 46ECh. 7.1 - Find the vertex, focus, and directrix of each...Ch. 7.1 - Prob. 48ECh. 7.1 - Prob. 49ECh. 7.1 - Prob. 50ECh. 7.1 - Prob. 51ECh. 7.1 - Prob. 52ECh. 7.1 - Find the vertex, axis of symmetry, x-intercepts,...Ch. 7.1 - Find the vertex, axis of symmetry, x-intercepts,...Ch. 7.1 - Find the vertex, axis of symmetry, x-intercepts,...Ch. 7.1 - Prob. 56ECh. 7.1 - Find the vertex, axis of symmetry, x-intercepts,...Ch. 7.1 - Find the vertex, axis of symmetry, x-intercepts,...Ch. 7.1 - Find the vertex, axis of symmetry, x-intercepts,...Ch. 7.1 - Prob. 60ECh. 7.1 - Prob. 61ECh. 7.1 - Prob. 62ECh. 7.1 - Prob. 63ECh. 7.1 - Prob. 64ECh. 7.1 - Find the vertex, axis of symmetry, x-intercept,...Ch. 7.1 - Prob. 66ECh. 7.1 - Prob. 67ECh. 7.1 - Prob. 68ECh. 7.1 - Prob. 69ECh. 7.1 - Prob. 70ECh. 7.1 - Find the vertex, axis of symmetry, x-intercept,...Ch. 7.1 - Prob. 72ECh. 7.1 - Prob. 73ECh. 7.1 - Prob. 74ECh. 7.1 - Prob. 75ECh. 7.1 - Prob. 76ECh. 7.1 - Prob. 77ECh. 7.1 - Prob. 78ECh. 7.1 - Find the equation of the parabola determined by...Ch. 7.1 - Prob. 80ECh. 7.1 - Solve each problem. The Hale Telescope The focus...Ch. 7.1 - Prob. 82ECh. 7.1 - Prob. 83ECh. 7.1 - Prob. 84ECh. 7.1 - Prob. 85ECh. 7.1 - Prob. 86ECh. 7.1 - Prob. 87ECh. 7.1 - Prob. 88ECh. 7.1 - Prob. 89ECh. 7.1 - Prob. 90ECh. 7.1 - Prob. 91ECh. 7.1 - Prob. 92ECh. 7.1 - Prob. 93ECh. 7.1 - Prob. 94ECh. 7.1 - Prob. 95ECh. 7.1 - Prob. 96ECh. 7.1 - Prob. 1PQCh. 7.1 - Find the vertex, focus, and directrix for
Ch. 7.1 - Prob. 3PQCh. 7.1 - For Individual or Group Explorations
Tangent...Ch. 7.2 - True or False? Explain.
1. The x-intercepts for ...Ch. 7.2 - Prob. 2FTCh. 7.2 - Prob. 3FTCh. 7.2 - Prob. 4FTCh. 7.2 - Prob. 5FTCh. 7.2 - Prob. 6FTCh. 7.2 - Prob. 7FTCh. 7.2 - Prob. 8FTCh. 7.2 - Prob. 9FTCh. 7.2 - True or False? Explain.
10. The radius of the...Ch. 7.2 - Fill in the blank. The set of all points in a...Ch. 7.2 - Prob. 2ECh. 7.2 - Prob. 3ECh. 7.2 - Prob. 4ECh. 7.2 - Each of the following graphs shows an ellipse...Ch. 7.2 - Prob. 6ECh. 7.2 - Each of the following graphs shows an ellipse...Ch. 7.2 - Prob. 8ECh. 7.2 - Find the equation of each ellipse described below...Ch. 7.2 -
Find the equation of each ellipse described below...Ch. 7.2 - Find the equation of each ellipse described below...Ch. 7.2 - Prob. 12ECh. 7.2 - Find the equation of each ellipse described below...Ch. 7.2 - Prob. 14ECh. 7.2 - Find the equation of each ellipse described below...Ch. 7.2 - Prob. 16ECh. 7.2 - Sketch the graph of each ellipse and identify the...Ch. 7.2 - Sketch the graph of each ellipse and identify the...Ch. 7.2 - Sketch the graph of each ellipse and identify the...Ch. 7.2 - Prob. 20ECh. 7.2 - Prob. 21ECh. 7.2 - Sketch the graph of each ellipse and identify the...Ch. 7.2 - Prob. 23ECh. 7.2 - Prob. 24ECh. 7.2 - Prob. 25ECh. 7.2 - Prob. 26ECh. 7.2 - Prob. 27ECh. 7.2 - Prob. 28ECh. 7.2 - Sketch the graph of each ellipse and identify the...Ch. 7.2 - Prob. 30ECh. 7.2 - Prob. 31ECh. 7.2 - Prob. 32ECh. 7.2 - Prob. 33ECh. 7.2 - Prob. 34ECh. 7.2 - Prob. 35ECh. 7.2 - Prob. 36ECh. 7.2 - Sketch the graph of each ellipse and identify the...Ch. 7.2 - Prob. 38ECh. 7.2 - Find the equation of each ellipse and identify its...Ch. 7.2 - Prob. 40ECh. 7.2 - Find the equation of each ellipse and identify its...Ch. 7.2 - Prob. 42ECh. 7.2 - Prob. 43ECh. 7.2 - Prob. 44ECh. 7.2 - Prob. 45ECh. 7.2 - Prob. 46ECh. 7.2 - Prob. 47ECh. 7.2 - Prob. 48ECh. 7.2 - Prob. 49ECh. 7.2 - Prob. 50ECh. 7.2 - Prob. 51ECh. 7.2 - Prob. 52ECh. 7.2 - Prob. 53ECh. 7.2 - Prob. 54ECh. 7.2 - Prob. 55ECh. 7.2 - Prob. 56ECh. 7.2 - Prob. 57ECh. 7.2 - Prob. 58ECh. 7.2 - Prob. 59ECh. 7.2 - Prob. 60ECh. 7.2 - Prob. 61ECh. 7.2 - Prob. 62ECh. 7.2 - Prob. 63ECh. 7.2 - Prob. 64ECh. 7.2 - Prob. 65ECh. 7.2 - Prob. 66ECh. 7.2 - Prob. 67ECh. 7.2 - Prob. 68ECh. 7.2 - Prob. 69ECh. 7.2 - Prob. 70ECh. 7.2 - Prob. 71ECh. 7.2 - Prob. 72ECh. 7.2 - Prob. 73ECh. 7.2 - Prob. 74ECh. 7.2 - Write each of the following equations in one of...Ch. 7.2 - Prob. 76ECh. 7.2 - Prob. 77ECh. 7.2 - Prob. 78ECh. 7.2 - Prob. 79ECh. 7.2 - Prob. 80ECh. 7.2 -
Solve each problem.
81. Foci and a Point Find the...Ch. 7.2 - Solve each problem. Foci and Eccentricity Find the...Ch. 7.2 - Solve each problem. Focus of Elliptical Reflector...Ch. 7.2 - Prob. 84ECh. 7.2 - Solve each problem. Comet Hale-Bopp Comet...Ch. 7.2 - Prob. 86ECh. 7.2 - Prob. 87ECh. 7.2 - Solve each problem. Adjacent Circles A...Ch. 7.2 - Prob. 89ECh. 7.2 -
Solve each problem.
90. Orbit of Mir The...Ch. 7.2 - Solve each problem. Tangent to an Ellipse It can...Ch. 7.2 - Prob. 92ECh. 7.2 - Prob. 93ECh. 7.2 - Prob. 94ECh. 7.2 - Prob. 95ECh. 7.2 - Prob. 96ECh. 7.2 - Prob. 97ECh. 7.2 - Prob. 98ECh. 7.2 - Prob. 99ECh. 7.2 - Prob. 100ECh. 7.2 - Prob. 101ECh. 7.2 - Prob. 102ECh. 7.2 - Prob. 103ECh. 7.2 - Prob. 104ECh. 7.2 - Prob. 1PQCh. 7.2 - Prob. 2PQCh. 7.2 - Prob. 3PQCh. 7.2 - Prob. LCCh. 7.3 -
True or False? Explain.
1. The graph of is a...Ch. 7.3 - Prob. 2FTCh. 7.3 - Prob. 3FTCh. 7.3 - Prob. 4FTCh. 7.3 - Prob. 5FTCh. 7.3 - Prob. 6FTCh. 7.3 - Prob. 7FTCh. 7.3 - Prob. 8FTCh. 7.3 - Prob. 9FTCh. 7.3 - Prob. 10FTCh. 7.3 - Prob. 1ECh. 7.3 - Prob. 2ECh. 7.3 - Prob. 3ECh. 7.3 - Prob. 4ECh. 7.3 - Each of the following graphs shows a hyperbola...Ch. 7.3 - Prob. 6ECh. 7.3 - Prob. 7ECh. 7.3 - Prob. 8ECh. 7.3 - Determine the foci and the equations of the...Ch. 7.3 - Prob. 10ECh. 7.3 - Determine the foci and the equations of the...Ch. 7.3 - Prob. 12ECh. 7.3 - Determine the foci and the equations of the...Ch. 7.3 - Prob. 14ECh. 7.3 -
Determine the foci and the equations of the...Ch. 7.3 - Prob. 16ECh. 7.3 - Prob. 17ECh. 7.3 - Prob. 18ECh. 7.3 - Prob. 19ECh. 7.3 - Prob. 20ECh. 7.3 - Sketch the graph of each hyperbola. Determine the...Ch. 7.3 - Prob. 22ECh. 7.3 - Prob. 23ECh. 7.3 - Prob. 24ECh. 7.3 - Prob. 25ECh. 7.3 -
Sketch the graph of each hyperbola. Determine the...Ch. 7.3 - Prob. 27ECh. 7.3 - Prob. 28ECh. 7.3 -
Find the equation of each hyperbola described...Ch. 7.3 - Prob. 30ECh. 7.3 - Prob. 31ECh. 7.3 - Prob. 32ECh. 7.3 - Prob. 33ECh. 7.3 - Prob. 34ECh. 7.3 - Find the equation of each hyperbola.Ch. 7.3 - Prob. 36ECh. 7.3 - Prob. 37ECh. 7.3 - Prob. 38ECh. 7.3 - Prob. 39ECh. 7.3 - Prob. 40ECh. 7.3 - Prob. 41ECh. 7.3 - Prob. 42ECh. 7.3 - Prob. 43ECh. 7.3 - Prob. 44ECh. 7.3 - Rewrite each equation in one of the standard forms...Ch. 7.3 - Prob. 46ECh. 7.3 - Prob. 47ECh. 7.3 - Prob. 48ECh. 7.3 - Prob. 49ECh. 7.3 - Prob. 50ECh. 7.3 - Prob. 51ECh. 7.3 - Prob. 52ECh. 7.3 - Solve each problem.
53. Telephoto Lens The focus...Ch. 7.3 - Prob. 54ECh. 7.3 - Prob. 55ECh. 7.3 - Prob. 56ECh. 7.3 - Prob. 57ECh. 7.3 - Prob. 58ECh. 7.3 - Prob. 59ECh. 7.3 - Prob. 60ECh. 7.3 - Prob. 61ECh. 7.3 - Prob. 62ECh. 7.3 - Prob. 63ECh. 7.3 - Prob. 64ECh. 7.3 - Prob. 65ECh. 7.3 - Prob. 66ECh. 7.3 - Prob. 67ECh. 7.3 - Prob. 68ECh. 7.3 - Transporting a Pipe Two corridors are 8 ft wide...Ch. 7.3 - 70. A Little Lagniappe A regulation basketball in...Ch. 7.3 - Prob. 1PQCh. 7.3 - Prob. 2PQCh. 7.3 - Prob. LCCh. 7 - For Exercises 1–6, sketch the graph of each...Ch. 7 - Prob. 2RECh. 7 - Prob. 3RECh. 7 - Prob. 4RECh. 7 - Prob. 5RECh. 7 - Prob. 6RECh. 7 - Sketch the graph of each ellipse, and determine...Ch. 7 - Prob. 8RECh. 7 - Prob. 9RECh. 7 - Sketch the graph of each ellipse, and determine...Ch. 7 - Sketch the graph of each ellipse, and determine...Ch. 7 - Prob. 12RECh. 7 - Prob. 13RECh. 7 - Prob. 14RECh. 7 - Prob. 15RECh. 7 - Prob. 16RECh. 7 - Prob. 17RECh. 7 - Prob. 18RECh. 7 - Prob. 19RECh. 7 - Prob. 20RECh. 7 - Prob. 21RECh. 7 - Prob. 22RECh. 7 - Prob. 23RECh. 7 - Prob. 24RECh. 7 - Prob. 25RECh. 7 - Prob. 26RECh. 7 - Sketch the graph of each hyperbola. Determine the...Ch. 7 - Prob. 28RECh. 7 - Prob. 29RECh. 7 - Prob. 30RECh. 7 - Prob. 31RECh. 7 - Prob. 32RECh. 7 - Prob. 33RECh. 7 - Prob. 34RECh. 7 - Prob. 35RECh. 7 - Prob. 36RECh. 7 - Prob. 37RECh. 7 - Prob. 38RECh. 7 - Prob. 39RECh. 7 - Prob. 40RECh. 7 - Prob. 41RECh. 7 - Prob. 42RECh. 7 - Prob. 43RECh. 7 - Prob. 44RECh. 7 - Prob. 45RECh. 7 - Prob. 46RECh. 7 - Prob. 47RECh. 7 - Determine the equation of each conic section...Ch. 7 - Prob. 49RECh. 7 - Prob. 50RECh. 7 - Prob. 51RECh. 7 - Prob. 52RECh. 7 - Prob. 53RECh. 7 - Prob. 54RECh. 7 - Prob. 55RECh. 7 - Prob. 56RECh. 7 - Prob. 57RECh. 7 - Prob. 58RECh. 7 - Prob. 59RECh. 7 - Prob. 60RECh. 7 - Solve each problem. Whispering Gallery In the...Ch. 7 - Prob. 62RECh. 7 - Prob. 63RECh. 7 - Prob. 1CTCh. 7 - Prob. 2CTCh. 7 - Prob. 3CTCh. 7 - Prob. 4CTCh. 7 - Prob. 5CTCh. 7 - Prob. 6CTCh. 7 - Prob. 7CTCh. 7 - Prob. 8CTCh. 7 - Prob. 9CTCh. 7 - Determine whether each equation is the equation of...Ch. 7 - Prob. 11CTCh. 7 - Prob. 12CTCh. 7 - Prob. 13CTCh. 7 - Prob. 14CTCh. 7 - Prob. 15CTCh. 7 - Prob. 16CTCh. 7 - Prob. 17CTCh. 7 - Prob. 18CTCh. 7 - Prob. 19CTCh. 7 - Prob. 1TATCh. 7 - Prob. 2TATCh. 7 - Prob. 3TATCh. 7 - Prob. 4TATCh. 7 - Prob. 5TATCh. 7 - Prob. 6TATCh. 7 - Prob. 7TATCh. 7 - Prob. 8TATCh. 7 - Prob. 9TATCh. 7 - Prob. 10TATCh. 7 - Prob. 11TATCh. 7 - Prob. 12TATCh. 7 - Prob. 13TATCh. 7 - Prob. 14TATCh. 7 - Prob. 15TATCh. 7 - Prob. 16TATCh. 7 - Prob. 17TATCh. 7 - Prob. 18TATCh. 7 - Prob. 19TATCh. 7 - Prob. 20TATCh. 7 - Prob. 21TATCh. 7 - Prob. 22TATCh. 7 - Prob. 23TATCh. 7 - Prob. 24TATCh. 7 - Prob. 25TATCh. 7 - Prob. 26TATCh. 7 - Prob. 27TATCh. 7 - Prob. 28TATCh. 7 - Prob. 29TATCh. 7 - Prob. 30TATCh. 7 - Prob. 31TATCh. 7 - Prob. 32TATCh. 7 - Prob. 33TATCh. 7 - Prob. 34TATCh. 7 - Prob. 35TATCh. 7 - Prob. 36TATCh. 7 - Prob. 37TATCh. 7 - Prob. 38TATCh. 7 - Prob. 39TAT
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