Question

How do you do this math problem:
x/x^2-y^2 + y/x^2-y^2
answer options:
A. 1/x-y
B. 1/x+y
C. -1/x+y
D. 1/y-x

Answer 1

Do you know \[\frac{ a }{ b } + \frac{ d }{ c } = \frac{ ac + db}{ bc }\]?

Answer 2

no
Thank you again!
So it's B??

Answer 3

No

can you factor x^2 - y^2 ?

Answer 4

the result of the addition is

x + y
---------
x^2 - y^2

If we factor the denominator we can simplify

Answer 5

ok Its C

Answer 6

I though when you simplify x^2-y^2 you get (x+y)(x-y)

Answer 7

I think you are guessing

x^2 - y^2 is an example of the difference of 2 squares

x^2 - y^2 = ( x + y)( x - y)