# Math Help - sum of two roots

1. ## sum of two roots

find

2. Originally Posted by fxs12
find

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

3. there is asecond solution

4. 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

5. 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.