Chapter 9 - Section 9.1 - Sequences - 9.1 Assess Your Understanding - Page 647: 37

The first five terms are: $a_1= -2$ $a_2 = 0$ $a_3 = 3$ $a_4 =7$ $a_5= 12$

Use the given recursive formula to find the next four terms: $a_1= -2$ $a_2 = 2+ a_1 = 2+(-2)=0$ $a_3 = 3+ a_2 = 3+0 = 3$ $a_4 = 4+a_3 = 4+3 =7$ $a_5= 5+ a_4 = 5+7=12$