Chapter 1 - Equations and Inequalities - 1.8 Absolute Value Equations and Inequalities - 1.8 Exercises - Page 167: 26

(a) $\{0\}$; (b) $(-\infty,\infty)$; (c) $\{0,\pm1\}$; (d) $\{\emptyset\}$;

Keep in mind that an absolute value returns a positive number or zero, by inspection, we have: (a) solution set is $\{0\}$; (b) solution set is $(-\infty,\infty)$; (c) solution set is $\{0,\pm1\}$; (d) solution set is $\{\emptyset\}$;