Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 1 - Functions and Their Graphs - Section 1.1 Functions - 1.1 Assess Your Understanding - Page 54: 32


$\text{$y$ is NOT a function of $x$.}$

Work Step by Step

For an equation to be a function: any input $x$ will yield only one output $y$ If $x=0$ $$y = \pm \sqrt{1-2(0)} = \pm \sqrt{1} = \pm 1$$ As there are two different outputs resulting from the same input, the equation isn't a function
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