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find http://www.mathmontada.net/vb/upload...1300539902.png

Quote: Originally Posted by fxs12 find http://www.mathmontada.net/vb/upload...1300539902.png Hint: Try squaring it (and then take the square root after simplifying the result).

there is asecond solution

Quote: Originally Posted by fxs12 there is asecond solution But only one of 6 or 4*sqrt(2) is correct. I admit I don't know how to tell which is right without a calculator though. -Dan

Quote: Originally Posted by topsquark But only one of 6 or 4*sqrt(2) is correct. I admit I don't know how to tell which is right without a calculator though. -Dan Six is correct. The 4*root(2) solution comes from when the first square root term is negative, as no sign is specified.