Asked by Piwo
A sequence is formed by adding together the corresponding terms of a geometric sequence and and an arithmetic sequence.The common ratio of the geometric sequence is 2 and the common difference of the arithmetic sequence is 2.The first term of the new sequence is 1 and the second term is 7.
Could you please help me find the third term of the new sequence.
Thank you.
Could you please help me find the third term of the new sequence.
Thank you.
Answers
Answered by
Steve
AS: a+2n
GS: b*2^(n-1)
a+b = 1
a+2 + 2b = 7
a + b = 1
a + 2b = 5
b = 4
a = -3
-3 + 2n: -3 -1 1 3 5
4*2^(n-1): 4 8 16 32 64
sum: 1 7 17 35 69
Looks like 17
GS: b*2^(n-1)
a+b = 1
a+2 + 2b = 7
a + b = 1
a + 2b = 5
b = 4
a = -3
-3 + 2n: -3 -1 1 3 5
4*2^(n-1): 4 8 16 32 64
sum: 1 7 17 35 69
Looks like 17
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