Why is (n-1)(n+1)=n^2-1?
13.06.2025 01:43

xx
xxx x
xxx
What made you recently say to yourself, “Wait. Really?”
So, that’s a rectangle with sides 2 and 4.
n^2 - 1
The basic answer is that you cross-multiply the values in each factor:
How is sex in college like with roommates and big campuses?
xxx
xxxx
Move the nub up to the top:
Do you think Trump is a bad a$$? Why or why not?
And you are left with almost a square. One less than the square of side n.
xxxx
xxx x
What are some of your favorite hip hop lyrics?
If you cut off the end of that rectangle, you make it smaller, 2 * 3 and a separate nub of size 1 * 2
(n - 1)(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
What is the reason for writing X^2 as XX instead of X*X?
n^2 - n + n - 1