- #1
Erubus
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Homework Statement
Find the sum of infinite the series (-1)^n * 7^n/n! for n=1 to infinity
Homework Equations
e^x = sum (x^n)/n! for n=0 to infinity
The Attempt at a Solution
I combined the (-1)^n and the 7^n to make the summation ((-7)^n)/n! for n = 1 to infinity
then I changed the lower bound to 0 to make it similar to e^x
((-7)^(n+1))/(n+1)! for n=0 to infinity
I don't know where to go from here, help would be appreciated!