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

Last Updated: 22.06.2025 04:53

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

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

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

(n - 1)(n + 1)

UNC Roughs Up Oklahoma, Seizes Control of NCAA Regional - 247Sports

xxxx

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

xxx x

Is the Trump-Zelenskyy meeting a preview of what the US is going to do to Taiwan?

xxx

xx

n^2 - 1

Do you think that drug addiction is a symptom of larger societal ills? What is it about our culture that leaves so many feeling like they're inadequate, trying any ill to find a cure?

n^2 - n + n - 1

xxx

xxxx

Every time I brush my hair when it’s dry it poofs up like a poof ball. But if I don’t brush it looks tangled and messy. I know I have some sort of curl or wavy hair, ive tried gels to define curls but it makes my hair frizzy and messy. What do I do?

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

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

Move the nub up to the top:

What was your first gay male experience?

xxx x