Posted by John on Sunday, April 5, 2009 at 3:34pm.
suppose I have
1 + x + x^2 + x^3 + ...
this is a geometric series with
a = 1 and r = x
S∞ = a/(1-r)
= 1/(1 - x)
so in a) you have
5/(1-3x)
this would match the terms
5 + 5(3x) + 5(3x)^2 + 5(3x)^3 + ...
You did not state whether you have to give the answer in Sigma notation, but I am pretty sure you could change it into that notation, if you study series at this level.
for c), simplify
6/(2-4x) to 3/(1 - 2x) and proceed as above.
MY ANSWERS:
(a) ax = 5(3x)^(x-1)
(b) ax = 4(4x)^(x-1)
(c) ax = 3(2x)^(x-1)
I'm confused because all of those series have a divergent sum, and it looks like they're each supposed to be convergent.
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