Thread: sum of two roots

find

Originally Posted by fxs12

find

Hint: Try squaring it (and then take the square root after simplifying the result).

there is asecond solution

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

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.