How do you write the first five terms of the geometric sequence #a_1=5, a_(k+1)=-2a_k# and determine the common ratio and write the nth term of the sequence as a function of n?
2 Answers
Sep 29, 2017
first 5 terms
common ratio
nth term
Explanation:
first 5 terms
common ratio
is
nth term of any Gp
Oct 8, 2017
so,
=>
Also,
i.e.
so, our terms are
Hence, 1st term 5 and common ratio -2
Now, nth term is
i.e.
or,
With n = 7 we have:
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