Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 1 - Section 1.6 - Set Operations and Compound Inequalities - 1.6 Exercises - Page 109: 28

Answer

$(-1, 4)$ Refer to the graph below.

Work Step by Step

Solve each inequality. \begin{align*} -3x&\lt 3\\ \frac{-3x}{-3}&\gt\frac{3}{-3}\\ x&\gt -1 \end{align*} \begin{align*} x+2&\lt 6\\ x+2-2&\lt6-2\\ x&\lt 4 \end{align*} Thus, the given statement is equivalent to: $$x\gt -1 \text{ and } x \lt 4$$ The conjunction "and" means intersection so find the intersection of the two sets. Recall: The intersection of sets $A$ and $B$ is the set that contains the elements that are common to both sets. $x\gt-1$ includes all the real numbers that are greater than $-1$. $x\lt4$ includes all the real numbers that are less than $4$. Note the that numbers common to the two given sets are the numbers that are greater than $-1$ but less than $4$. Hence, the solution set is $(-1, 4)$. Graph the solution set by plotting hollow dots at $-1$ and $4$, then shading the region between them. (Refer to the graph above.)
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