Why is (n-1)(n+1)=n^2-1?
10.06.2025 12:39

xx
Move the nub up to the top:
xxx
150-Million-Year-Old Stegosaurus Skull Rewrites Dinosaur Evolution - SciTechDaily
n^2 - n + n - 1
xxx x
The basic answer is that you cross-multiply the values in each factor:
Proposed NASA cuts to space science: “Staggering” - EarthSky
xxxx
xxx x
n^2 - 1
Why do older men like to get anal sex?
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
So, that’s a rectangle with sides 2 and 4.
Do all therapists specialize in one specific type of therapy, or are they trained in multiple types?
(n - 1)(n + 1)
And you are left with almost a square. One less than the square of side n.
xxxx
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2