Question

The product of a number (n-1) and the number (n+1) is always equal to

3x5=4^2-1 6X8=7^2-1
4x6=5^2-1 7X9=8^2-1
5X7=6^2-1 8X10=9^2-1

Answer 1

(n-1)(n+1) = n^2-1


So the answer will depend on the value of n