another sigma notation question

[Louise Johnson]

I have a second sigma notation question I have completed and it would be great if someone could have a look at it.
Thank you
sincerly
Louise


Question: Use Sigma Notation to express the following infinite geometric sum and then evaluate the sum to two decimal places.
8+(-6)+4.5+(-3.375)+.....



\(\displaystyle \L\sum\limits_{i = 0}^\infty {8( - \frac{3}{4})_{}^i }\)

S= 4.57

 

[skeeter]

looks fine except for the initial value of your index ... should be i = 0 instead of i = 1.

the sum is 32/7 ... avoid the decimal approximation when possible.

 

[Louise Johnson]

I forgot to say thankyou
Skeeter!