I've tried many things, can't seem to work it out. Thank you!
1. because , substitute that into
2. Common denominator of the fractions in the numerator
3. combine fractions in the numerator
4. simplify (dividing a fraction by something means multiplying by it's inverse):
5. factor out in the numerator
in the numerator and denominator cancel eachother out
6. Multiply the numerator and the denominator by
7. FOIL the numerator:
8. Using the formula see that and substitute that into the equation
9. is in the numerator and the denominator, so cancel them out