Question

Show that n *n -1 is divisible by 8 if n is an odd positive integer

Answer 1

n=9 because 9*9=81, 81-1= 80, it is divisible by 8

Answer 2

Answer:let n be 3(odd positive integer)

Substitute n=3 in n^2 - 1

=3×3-1

=9-1

=8

And 8 is divisible by 8

Another example....

Let n be 7(off positive integer)

=7×7-1

=49-1

=48

And 48 is divisible by 8!

Hence n^2-1 is divisible by 8!!

Hope it helps you friends!❤