algebra chapter 8

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9 Terms

1
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When difference is doubling

use 2ᴺ — 2, 4, 8, 16, 32

2
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when the difference is being progressively added added ex:

use N2 — 1, 4, 9, 16, 25, 36

3
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4
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an (arithmetic) =

a1+(n-1)d

5
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an (geometric) =

an = a1 • r (n - 1)

6
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infinite geometric sum =

S = a / (1 - r)

7
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certain # geometric sum =

a(1 - rn) / (1 - r)

8
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1, 3, 5, 7 (adding 2)

2𝑛−1

9
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sum of arithmetic sequence =

Sn=n(a1+an/2)