Find the sum of the following infinite
geometric series. Use a formula and
show your work.
(100)+(-40)+(16)+(-32)+etc...forever
5
Hint: r = (-2)
5
thats -32/5.... and on the hint is -2/5
Do you mean its - ?
Since the hint says to try , we can plug that in to our values and see what happens
So we see that each term is changing by a factor of . Now we know the equation for a geometric series is where a is the first term and r is the ratio. Plug in the first term in the series for a, and plug in the ratio r, and then solve the equation to find the sum of the series.