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: 23

Answer

$\text{(a)}\quad$ $7\gt 0$ $\text{(b)}\quad$ $-1\gt -8$ $\text{(ac}\quad$ $ 12\gt -9$ $\text{(d)}\quad$ $-8\lt 6$.

Work Step by Step

The given inequality is $\Rightarrow 4\gt -3$ (a) Add $3$ to each side. $\Rightarrow 4+3\gt -3+3$ Simplify. $\Rightarrow 7\gt 0$. (b) Subtract $5$ from each side. $\Rightarrow 4-5\gt -3-5$ Simplify. $\Rightarrow -1\gt -8$. (c) Multiply each side by $3$. $\Rightarrow 3\cdot 4\gt 3\cdot (-3)$ Simplify. $\Rightarrow 12\gt -9$. (d) Multiply each side by $-2$ and change the direction of the inequality. $\Rightarrow -2\cdot 4\lt -2\cdot (-3)$ Simplify. $\Rightarrow -8\lt 6$.
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