now my textbook says you have to multiply the numerator and denominator by Squareroot (x-2) + 2

i understand the we multiply the numerator and denominator by square root (x-2) .. but how come + 2 and not -2?

Also can someone kindly explain how to get to teh final answer? with explanation in each step. thank you very much.[/QUOTE]

because . Multiplying by gives and gets rid of the square root.