Question

Find the value of an =(-1)^n-1 5^n+1 for n=2and n=3

Answer 1

here the value of n is 2
then (-1)^2 - 15 ^2 +1
1 - 225 +1
1-226
-225

here the value of n is 3
then (-1)^3 - 15^3 +1
-1 - 3375 + 1
- 3375