Chapter 9 - Sequences and Series - 9-1 Mathematical Patterns - Practice and Problem-Solving Exercises - Page 569: 14

The first six terms, in order, are: $-3, 9, -27, 81, -243, 729$

Substitute n with 1, 2, 3, 4, 5, 6 $a_{n}=(-3)^{n}$ $a_{1}=(-3)^{1}=-3$ $a_{2}=(-3)^{2}=9$ $a_{3}=(-3)^{3}=-27$ $a_{4}=(-3)^{4}=81$ $a_{5}=(-3)^{5}=-243$ $a_{6}=(-3)^{6}=729$