SOLUTION: Hi, having some problems with the following question any chance some one could step by step walk me though it please Q. find a formula for the sum of x^2+x^6+x^10+...+x^2+4

Question 357898: Hi,
having some problems with the following question any chance some one could step by step walk me though it please
Q. find a formula for the sum of
x^2+x^6+x^10+...+x^2+4n+...+x^42
What will be the sum of the series when x = 1?
Also finding this one tricky to:
Q. obtain the sum of the infinite geometric progression
2-2/3+2/9-2/27+...
Any help would be very helpful
Thanks :)
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

Find the number of terms.

Since the terms start at 0 and not 1, then there are 11 terms altogether.
Eleven terms, each having a value of 1.

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