Logo

Why is (n-1)(n+1)=n^2-1?

Last Updated: 21.06.2025 00:33

Why is (n-1)(n+1)=n^2-1?

(n - 1)(n + 1)

n^2 - n + n - 1

xxx x

Do all armies have the same rank structure?

So, that’s a rectangle with sides 2 and 4.

xxx

Move the nub up to the top:

Is dating in college necessary? Why and why not?

xx

xxx

The basic answer is that you cross-multiply the values in each factor:

Harvard gastroenterologist ranks popular trends: Is eating cold rice, doing intermittent fasting good for gut health? | Health - Hindustan Times - Hindustan Times

xxxx

xxxx

The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2

What misfortune led to an important discovery?

If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2

And you are left with almost a square. One less than the square of side n.

xxx x

Why does the UK Labour MP Jess Philips seem to be such a divisive figure?

n^2 - 1