Question

If n is an odd integer, then show that n 2 – 1 is divisible by 8.

Answer 1

Step-by-step explanation:

By putting n=3, 5,7, 9

we get

3^2-1=9-1=8

5^2-1=25-1=24

7^2-1=49-1=48

9^2-1=81-1=80.

All answers are divisible by 8.