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Could you explain where you are running into problems and maybe I can help you get past them. I don't think you learn much if I just do the problem for you.
How can i simplify the denominator ?
Hint: recall the difference of 2 squares. $\displaystyle a^2-b^2=(a+b)(a-b)$ Think of the denominator as (a-b) Think you can take it from here? Think about it for a minute or two and if you still can't get it, let me know.
Why have you got brackets in the denoninator?
Originally Posted by Wilmer Why have you got brackets in the denoninator? Probably just to specify which sign they're going to change first...
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