1. Sequences
COURSE 3 LESSON 12-1
Find the first four terms of the sequence represented by each expression.
a. (n – 1)n
Term number (n)
Term of (1 – 1)1 (2 – 1)2 (3 – 1)3 (4 – 1)4
Sequence = 0 = 2 = 6 = 12
b (n – 1)
Term number (n)
Term of (1 – 1) 1 + 2(2 – 1) 1 + 2(3 – 1) 1 + 2(4 – 1)
Sequence = 1 = 3 = 5 = 7
12-1

2. Sequences (continued) c. 5 • 2n + 1 Term number (n) 1 2 3 4
COURSE 3 LESSON 12-1
(continued)
c. 5 • 2n + 1
Term number (n)
Term of 5 • • • •
Sequence = 20 = 40 = 80 = 160
12-1

3. Sequences Write a rule for each sequence. 1. 1, 8, 64, 512, . . .
COURSE 3 LESSON 12-1
Sequences
Write a rule for each sequence.
1. 1, 8, 64, 512, . . .
2. 100, 85, 70, 55, . . .
3. –2, –6, –18, –54, . . .
4. Write the first four terms of the sequence represented by –7n + 21.
Start with 1 and multiply by 8 repeatedly.
Start with 100 and add –15 repeatedly.
Start with –2 and multiply by 3 repeatedly.
14, 7, 0, –7
12-1