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

Last Updated: 03.07.2025 04:29

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

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

xxxx

xxxx

What is your opinion on the UK Labour party's pledge to build 1.5 million homes over the parliament to tackle the country's housing crisis?

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

xx

xxx

4 'Healthy' Trends That Need to Stop Now, According to a Dietitian - EatingWell

n^2 - n + n - 1

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

xxx x

They say that the Democrats media is able to gaslight their ignorant followers. How true is that, and is the fact that Democrats have echoed that Jan 6th was worse than 9/11 or Pearl Harbor proof of that, via gaslighting their ignorant followers?

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

Move the nub up to the top:

(n - 1)(n + 1)

What are some good tips for dealing with unmedicated ADHD?

xxx

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

n^2 - 1

Scientists point to one particular sleep stage as being most important for preventing dementia - Earth.com

xxx x