Why is (n-1)(n+1)=n^2-1?
10.06.2025 00:26

(n - 1)(n + 1)
n^2 - n + n - 1
xxxx
I have the power to talk to aliens through using telepathy. Why do people think I'm crazy?
xx
xxx
So, that’s a rectangle with sides 2 and 4.
8 best walking exercises that will help us lose 3-4 kgs within a month - Times of India
xxx x
n^2 - 1
xxxx
Procter & Gamble says it will cut 7,000 jobs over the next 2 years - CBS News
Move the nub up to the top:
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
And you are left with almost a square. One less than the square of side n.
xxx x
The basic answer is that you cross-multiply the values in each factor:
xxx
WCWS Game 2: Texas Tech evens series with 4-3 win, setting up decisive Game 3 - Yahoo Sports
The more direct answer is to look at a rectangle with sides of n + 1 and n - 1, let’s go with n = 2