Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Appendix A - Section A.1 - Introduction to Functions - A.1 Problem Set - Page 487: 25

Answer

Refer to Graph I Domain is {$x$ | $x \ge 4$} Range is all real numbers of $y$ The graph is not a graph of function
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Work Step by Step

Refer to Graph I for the graph of $x$ = $y^2$ + 4 (in black color). The domain is {$x$ | $x \ge 4$}. and the range is all real numbers of $y$. By means of vertical line test (in red color), the graph is not a graph of function since at any x-value > 4, the line cuts the graph at more than one y-value.
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