anonymous 4 years ago Please explain...

1. anonymous

its simply, really

2. anonymous

$6\div r ^{2}-1 -1\div2=1\div r-1$

3. anonymous

lcd=$(r ^{2}-1)(r+1)(2)?$

4. anonymous

the last term is suppose to be 1/r+1

5. asnaseer

is this your question?:$\frac{6}{r^2-1}-\frac{1}{2}=\frac{1}{r+1}$

6. anonymous

yes

7. asnaseer

use the fact that:$r^2-1=(r+1)(r-1)$

8. anonymous

okay r^2-1 = (r+1)(r-1) make all the denominators match

9. asnaseer

and then multiply both sides by (r+1). that should simplify the expression.

10. asnaseer

I need to leave now - but hopefully there are plenty of people here that can assist you...