College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Chapter 1 Review - Exercises - Page 171: 101

Answer

$x=\left\{-1, 7\right\}$ Refer to the image below for the graph.
1509736491

Work Step by Step

To solve the given equation graphically, perform the following steps: (1) Let each side of the equation represent a function then graph each function on the same coordinate plane. Graph $y=x^2-4x$ (the blue graph) and $y=2x+7$ (the red graph). (refer to the attached image in the answer part above for the graph) (2) Identify the point/s where the two graphs intersect. The x-coordinate of point of intersection is a solution of the given equation. The graphs intersect at $(-1, 5)$ and $(7, 21)$. Therefore, the solutions to the given equation are: $x=\left\{-1, 7\right\}$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.