Worksheet 50 - Geometric Sequences.ks-ia2
Math Analysis Honors - Worksheet 50
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Geometric Sequences
Determine if the sequence is geometric. If it is, find the common ratio, the explicit formula, and the recursive formula.
1) -4, 20, -100, 500, ...
2) 4, 20, 100, 500, ...
3) 4, 24, 144, 864, ...
4) 3, -12, 48, -192, ...
Given the explicit formula for a geometric sequence find the term named in the problem and the recursive formula.
5) a = 3 3n - 1 n Find a 9
6) a = -2 4n - 1 n Find a 10
7) a = -3 2n - 1 n Find a 12
8) a = -(-3)n - 1 n Find a 11
Given the first term and the common ratio of a geometric sequence find the term named in the problem, the explicit formula, and the recursive formula.
9) a = 1, r = -2 1 Find a 10
10) a = 1, r = 2 1 Find a 12
11) a = 1, r = 3 1 Find a 9
12) a = 2, r = -3 1 Find a 9
Given a term in a geometric sequence and the common ratio find the explicit formula.
13) a = -36, r = 6 3
14) a = 64, r = 2 6
Determine the number of terms n in each arithmetic series.
15) 24 + 34 + 44 + 54..., S = 2166 n
16) (-6) + (-4) + (-2) + 0..., S = 0 n
Evaluate each arithmetic series described.
17) (-7) + (-5) + (-3) + (-1)..., n = 14
18) 33 + 39 + 45 + 51..., n = 14
Evaluate each series.
7
19) (2m2 - 4)
m = 2
12
20) n
n = 0
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Worksheet by Kuta Software LLC
1) Common Ratio: r = -5
Explicit: a = -4 (-5)n - 1 n
Recursive: a = a -5
n
n - 1
a = -4 1
4) Common Ratio: r = -4
Explicit: a = 3 (-4)n - 1 n
Recursive: a = a -4
n
n - 1
a =3 1
7) a = -6144 12
Recursive: a = a 2
n
n - 1
a = -3 1
Answers to
2) Common Ratio: r = 5
Explicit: a = 4 5n - 1 n
Recursive: a = a 5
n
n - 1
a =4 1
5) a = 19683 9
Recursive: a = a 3
n
n - 1
a =3 1
8) a = -59049 11
Recursive: a = a -3
n
n - 1
a = -1 1
10) a = 2048 12
11) a = 6561 9
Explicit: a = 2n - 1 n
Explicit: a = 3n - 1 n
Recursive: a = a 2
n
n - 1
Recursive: a = a 3
n
n - 1
a =1 1
a =1 1
13) a = -6n - 1 n
14) a = 2 2n - 1 n
15) 19
17) 84
18) 1008
19) 254
3) Common Ratio: r = 6
Explicit: a = 4 6n - 1 n
Recursive: a = a 6
n
n - 1
a =4 1
6) a = -524288 10
Recursive: a = a 4
n
n - 1
a = -2 1
9) a = -512 10
Explicit: a = (-2)n - 1 n
Recursive: a = a -2
n
n - 1
a =1 1
12) a = 13122 9
Explicit: a = 2 (-3)n - 1 n
Recursive: a = a -3
n
n - 1
a =2 1
16) 7
20) 78
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Worksheet by Kuta Software LLC
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