Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 13 - Section 13.4 - Nonlinear Inequalities and Systems of Inequalities - Exercise Set - Page 954: 32

Answer

Please see the graph.

Work Step by Step

Green lines: $x^{2}-y^{2}\ge1$ Purple line: $x\ge0$ $x^{2}-y^{2}\ge1$ This is the equation of a hyperbola. We have three regions to test to determine what region(s) to shade: $(-∞, -1]$, $[-1, 1]$, $[1, ∞)$. We pick the following values of $x$ to test (with keeping the $y$ coordinate $0$): $-2$, $0$, and $2$. $(-2,0)$ $x^{2}-y^{2}\ge1$ $(-2)^{2}-0^{2}\ge1$ $4 - 0 \ge 1$ $4 \ge 1$ (true, so we shade this region) $(0,0)$ $x^{2}-y^{2}\ge1$ $0^{2}-0^{2}\ge1$ $0 - 0 \ge 1$ $0 \ge 1$ (false) $(2,0)$ $x^{2}-y^{2}\ge1$ $(2)^{2}-0^{2}\ge1$ $4 - 0 \ge 1$ $4 \ge 1$ (true, so we shade this region) $x\ge0$ We pick the point $(1,1)$ to determine what region to shade. $(1,1)$ $x\ge0$ $1\ge0$ (true, so we shade this region) The solution set to the inequalities is the overlap of the two graphs.
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