Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Appendix A - Review - A.9 Interval Notation; Solving Inequalities - A.9 Assess Your Understanding - Page A79: 73

Answer

Set notation:$\quad \{x|3\leq x \leq 5\}$. Interval notation: $\quad[3,5]$. The graph is shown below.

Work Step by Step

Separate into two inequalities. $0\leq 2x-6\quad$ and $\quad 2x-6 \leq 4 $ Add $6$ to both sides of each inequality. $0+6\leq 2x-6+6 \quad $ and $\quad 2x-6+6 \leq 4+6 $ Simplify. $6\leq 2x \quad$ and $\quad2x\leq 10 $ Divide both sides by $2$. $\dfrac{6}{2}\leq \dfrac{2x}{2} \quad$ and $\quad\dfrac{2x}{2}\leq \dfrac{10}{2} $ Simplify. $3 \leq x $ and $x \leq 5 $ The solution set is $\{x|3\leq x \leq 5\}$. or interval notation is $[3,5]$. To graph, use an open bracket at $3$ and a close bracket at $5$ and shade the region in between.
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