Question

simplify 2a+2 over a^2-1

Answer 1

http://en.wikibooks.org/wiki/Basic_Algebra/Factoring/Factoring_a%5E2-b%5E2_Binomials

Answer 2

the denominator is a diff of squares

Answer 3

2
-----
(a - 1)?

Answer 4

\(a^2-1=(a+1)(a-1)\)

\(\dfrac{2a+2}{a^2-1}=\dfrac{2(a+1)}{(a+1)(a-1)}=\dfrac{2\cancel{(a+1)}}{\cancel{(a+1)}(a-1)}=\dfrac{2}{a-1}\)

Answer 5

looks good

Answer 6

thanks can you help me with some more questions?

Answer 7

nah, sorry. trying to focus on some other stuff I have to do

Answer 8

ok