## suzi20 4 years ago urgent ! satellite73 help me to find i: 8.76 = [ 1- (1+i)^-11 ] / i

1. elecengineer

if I is any variable

2. suzi20

i is just variable

3. dipankarstudy

plot the two graph y=8.76i-1 and y=-(1+i)^-11 find intersection point

4. elecengineer

then 8.76 i = 1 - (1+i)^(-11)

5. dipankarstudy

use online graphing

6. elecengineer

^ yeh, the best you can do its graphical it wont have an exact solution all you can do is approximate

7. satellite73

is that all over i? latex not workring?

8. suzi20

[ 1- (1+i)^-11 ] over i

9. elecengineer

yeh , it doesnt have exact solution

10. suzi20

this is anuity formula a subscript 11

11. elecengineer

now do you get a negative power then

12. elecengineer

if its a financial maths question then the power must be positive

13. suzi20

thats the formula for interest

14. satellite73

there is no algebra way to solve this. i think estimation is best, and i get .04

15. satellite73

in fact it is .04 to 4 decimal places, .0400

16. satellite73

and no the powers do not need to be positive. for example a payment formula has negative exponents.

17. suzi20

me too, i found 0.03993, by plug in to calculator, but i need a way to write in my paper