Chapter 1 - Limits and Continuity - 1.1 Limits (An Intuitive Approach) - Exercises Set 1.1 - Page 59: 7

a) -$\infty$ b) -$\infty$ c) -$\infty$ d) 1

a) $\lim\limits_{x \to 3^-}$ means limit as x approaches positive 3 from the left. As shown in the graph as x approaches 3 from the left, the value of x approaches negative infinity. b) $\lim\limits_{x \to 3^+}$ means limit as x approaches positive 3 from the right. As shown in the graph as x approaches 3 from the right, the value of x approaches negative infinity. c) as x approaches 3 from both sides the value of x approaches negative infinity d) the value of y when x is 3 equals 1.