1. The problem statement, all variables and given/known data Find the sum of infinite the series (-1)^n * 7^n/n! for n=1 to infinity 2. Relevant equations e^x = sum (x^n)/n! for n=0 to infinity 3. 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!