Logo

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

15.06.2025 03:22

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

n^2 - n + n - 1

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

Move the nub up to the top:

What does it mean when you dream that your mother died?

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

xxxx

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

Why do US military soldiers/officers have a chest full of medal ribbons when they probably haven't been in a combat situation? Are the medals for attendance, good behaviour, or long service perhaps?

n^2 - 1

xxx x

xxx x

Are you already having anal sex?

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

xx

(n - 1)(n + 1)

Does having the wrong address on my car insurance invalidate my policy?

xxxx

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

xxx

What specific economic and social impacts would result if all climate change policies and regulations were immediately repealed worldwide?

xxx