- #1
Topgun_68
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Homework Statement
The sequence {en} is defined recursively as e0 = 3; ek = 4ek-1 + 7, for all k ≥ 1. Use iteration to make an educated guess at an explicit formula for the sequence.
The attempt at a solution
I spent all day on this one and I'm still lost.
e1 = 4 x e0 + 7
= 4 x 3 + 7 {since e0 = 3}
= 19
e2 = 4 x e1 + 7
= 4 x 19 + 7 {since e1 = 19}
= 83
e3 = 4 x e2 + 7
= 4 x 83 + 7 {since e2 = 83
= 339
I came up with this, and it looks like a geometric sequence, but I can't figure out how to create the formula using the using Theorem 5.2.3 {Sum of a Geometric Sequence}
3 + 42 + 43 + 44 ... 4n+1
Thanks for any guidance!]
The sequence {en} is defined recursively as e0 = 3; ek = 4ek-1 + 7, for all k ≥ 1. Use iteration to make an educated guess at an explicit formula for the sequence.
The attempt at a solution
I spent all day on this one and I'm still lost.
e1 = 4 x e0 + 7
= 4 x 3 + 7 {since e0 = 3}
= 19
e2 = 4 x e1 + 7
= 4 x 19 + 7 {since e1 = 19}
= 83
e3 = 4 x e2 + 7
= 4 x 83 + 7 {since e2 = 83
= 339
I came up with this, and it looks like a geometric sequence, but I can't figure out how to create the formula using the using Theorem 5.2.3 {Sum of a Geometric Sequence}
3 + 42 + 43 + 44 ... 4n+1
Thanks for any guidance!]