Question

I need help with this equation:

Answer 1

\[\left(\begin{matrix}a ^{2}+1 \\ a ^{2}-1\end{matrix}\right)-\left(\begin{matrix}2 \\ a+1\end{matrix}\right)=\left(\begin{matrix}a \\ a+1\end{matrix}\right)\]

Answer 2

sweet jesus where would this pop up naturally lol

Answer 3

are those suppose to fractions?

Answer 4

yes their fractions

Answer 5

i think its nCr
\[\frac{n!}{r!(n-r)!}\]

Answer 6

\[\frac{a^2+1}{a^2-1}-\frac{2}{a+1}=\frac{a}{a+1}\]

Answer 7

lol joe
wouldnt that be a cool problem

Answer 8

i was already on it lolol

Answer 9

first of all a^2-1 is factorable right?
what are its factors?

Answer 10

i have no idea

Answer 11

the answer is 1.

Answer 12

you have to know how to factor before you can do a problem like this?

a^2-1 is the difference of two squares
you should have a formula that you use to factor it

a^2-b^2=(a-b)(a+b)

so what are the factors of a^2-1?