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

Last Updated: 20.06.2025 00:28

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

n^2 - 1

xxx x

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

Does any unofficial Roman Catholic card exist in the world to play? In Italy, Rome & the Vatican City, can practising Catholics get any discounts as a tourist, & / or privileged admission to certain sights, with different rules for non Catholics?

(n - 1)(n + 1)

xxx x

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

Why do I feel like something bad is going to happen to me?

n^2 - n + n - 1

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

xxxx

Why did Democrats echo that Joe Biden was greater than FDR and should be put on Mt Rushmore? Why did Democrats vote for Biden blindly in the primaries and deny he was mentally impaired? Was it the lying media, or are Democrats ignorant and gullible?

xxx

xx

Move the nub up to the top:

What is the most comfortable heel height for women's dress shoes and what are the differences between wearing high heels and lower heels?

xxxx

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

xxx

Are there any men who have sex with male dogs?

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