1. 1.6 Geometric Sequences
Geometric sequence: a sequence in which terms are found by multiplying a preceding term by a nonzero constant.

2. Recursive Form:
r= nonzero constant
Explicit Form: un = u1rn-1
Partial Sum:

3. Ex. 1 Is the sequence geometric , arithmetic, or neither
Ex. 1 Is the sequence geometric , arithmetic, or neither? (if geometric find r, if arithmetic find d)
A. 3, 6, 12, 24,…….
B. 10, 2, ,………
C. 4, 7, 10, 13,…..

4. Ex. 2 Write a recursive & explicit formula for the geometric sequence
Ex. 2 Write a recursive & explicit formula for the geometric sequence. U1 = 5 r = ½

5. Ex. 3 Find the kth partial sum: k = 7 u2 = 6 r = 2

6. Ex. 4 Write an explicit formula for the geometric sequence & find u8
Ex. 4 Write an explicit formula for the geometric sequence & find u8 . U2 = U5 =