Why is (n-1)(n+1)=n^2-1?
Last Updated: 22.06.2025 12:35
xxx x
xxx x
xx
Rocket Report: SpaceX’s 500th Falcon launch; why did UK’s Reaction Engines fail? - Ars Technica
n^2 - 1
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
n^2 - n + n - 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
Move the nub up to the top:
So, that’s a rectangle with sides 2 and 4.
ESA studying impacts of proposed NASA budget cuts - SpaceNews
xxx
xxx
And you are left with almost a square. One less than the square of side n.
Boulder attack updates: Multiple people injured in 'act of terror,' FBI says - ABC News
xxxx
(n - 1)(n + 1)
xxxx
How can someone living alone in their own apartment reduce the cost of their electric bills?
The basic answer is that you cross-multiply the values in each factor: