Check Recurrence Relation
The formula 1+r+r^2+...+r^n=(r^(n+1)-1)/(r-1) is true for all real numbers r except r=1 and for all integers n>=0. Use this fact to solve the following problem:
If n is an integer and n>=1, find a formula for the expression
For the values of r and n, I substituted r=(-2) and n=n-1 and got
Did I use the correct substitutions?
Re: Check Recurrence Relation
Originally Posted by lovesmath
Now apply the given formula to the expression in square brackets.