Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.5 - Equations - 1.5 Exercises - Page 56: 5


A. $\sqrt 2x = -x$ B. $\ 2x = x^2$ C. $\ x = 2, x = 0$ D. $\ x = 0$

Work Step by Step

Letter A asks to isolate the radical, therefore you must subtract the "x" to the other side. Letter B asks to square both sides. Squaring a radical leaves what's left inside the radical. For letter C, subtract "2x" to the other side and from there, you will have an equation to solve. "x" will equal 2 and 0. For letter D, plug in both solutions, however, only 0 will make the statement true.
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