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

Last Updated: 17.06.2025 12:41

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

xxx x

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

n^2 - 1

What do you think about Matt Gatz as an attorney general?

xxx x

xxx

xxxx

Can you share a story of someone who had a lucky experience while hitchhiking?

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

Move the nub up to the top:

n^2 - n + n - 1

I told my 13-year-old daughter that she should never start a fight, but has my permission to end it. She got suspended for ending a fight that some other girl picked with her by hitting her then retreating. How do I handle the school’s response?

xxx

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

xx

Are today’s baseball pitchers faster than a few years ago, or is it that radar guns have improved and get the pitch speed as it is released rather than as it reaches the plate?

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

xxxx

(n - 1)(n + 1)

I dreamt my mother had died and I cried so much in my dream. What does it mean?

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