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 1.4 Library of Functions; Piecewise-defined Functions - 1.4 Assess Your Understanding - Page 85: 3

Answer

The intercepts of the function are: $(0,-8), (2, 0)$

Work Step by Step

In order to solve this problem, we will have to recall the following points: (a) The intercepts of a function are those points where the graph crosses the $x-$ axis or the $y-$ axis. (b) We set $y=0$ and then solve for $x$ in order to calculate the x-intercept. (c) We set $x=0$ and then solve for $y$ in order to calculate the y-intercept. Case: 1 Let $y=0$ and the solve for $x$ to obtain: $y=x^3-8 \\ 0=x^3-8 \implies x =2$ Case: 2 Let $x=0$ and the solve for $y$ to obtain: $y=x^3-8 \\ y=0^3-8 \implies y=-8$ Therefore, the intercepts of the function are: $(0,-8), (2, 0)$
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