How do you combine #4/(x^2+4x-5) - 3/(x^2-1)#?
We can factor both denominators in order to find the lowest common denominator among them.
Using Bhaskara for the first equation
For the second equation, we can find the roots simply by equaling it to zero.
Now, we can rewrite your subtraction as:
The lowest common denominator must comprise all terms in the denominators, which lead us to
Now we know our denominator is
If you want to redistribute, it'll end up like this: