(a) the sum to infinity in terms of x
(b) the value of x for which this sum equals 22.
更新1:
thanks
sequence question
2008-09-13 1:26 am
The general term T(n) of an infinite geometric sequence is given by [3/(2x+1)]^n . Find
(a) the sum to infinity in terms of x
(b) the value of x for which this sum equals 22.
(a) the sum to infinity in terms of x
(b) the value of x for which this sum equals 22.
回答 (1)
2008-09-13 1:44 am
✔ 最佳答案
(a)The sum to infinity of T(n)
=[3/(2x+1)]/[1-[3/(2x+1)]]
=3/(2x-2)
(b)
3/(2x-2)=22
2x-2=3/22
2x=47/22
x=47/44
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