Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 2 - Functions and Their Graphs - 2.5 Graphing Techniques: Transformations - 2.5 Assess Your Understanding - Page 105: 77

Answer

(a) The point on the graph of y = ƒ(x + 3) – 5 is (-2,2). (b) The point on the graph of y = - 2ƒ(x - 2) + 1 is (3,-5). (c) The point on the graph of y = ƒ(2x + 3) is (-1,3).

Work Step by Step

To obtain the point, first we find the points on the graph of ƒ(x + 3). Horizontally shift left 3 units; subtract 3 from the x-coordinate on the graph of y = ƒ(x). We get (-2,3). Next we find the points on the graph of y = ƒ(x + 3) – 5. Vertically shift down 5 units; subtract 5 from the y-coordinate on the graph of ƒ(x + 3). We get (-2,-2). To obtain the point, first we find the points on the graph of y = ƒ(x - 2). Horizontally shift right 2 units; add 2 to the x-coordinate on the graph of y = ƒ(x). We get (3,3). Next we find the points on the graph of y = -2ƒ(x – 2). Vertically stretch by a factor of -2; multiply by -2 for the y-coordinate on the graph of y = ƒ(x - 2). We get (3,-6). Next we find the points on the graph of y = -2ƒ(x - 2) + 1. Vertically shift up 1 unit; add 1 to the y-coordinate on the graph of y = -2ƒ(x – 2). We get (3,-5). (c)To find the point is on the graph of y = ƒ(2x + 3) . To obtain the point, first we find the points on the graph of y = ƒ(2x). Horizontally compress by a factor of 2; multiply by 2 for the x-coordinate on the graph of y = ƒ(x). We get ( 2,3). Next we find the points on the graph of y = ƒ(2x + 3). Horizontally shift left 3 units; subtract 3 from the x-coordinate on the graph of y = ƒ(2). We get (-1,3).
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