Find Positive Square Root of 30

[xclusivzik]

find the positive square root of
70-20\sqrt{30}

 

[MarkFL]

Hello and welcome to MHB! :D

We ask that our users show their progress (work thus far or thoughts on how to begin) when posting questions. This way our helpers can see where you are stuck or may be going astray and will be able to post the best help possible without potentially making a suggestion which you have already tried, which would waste your time and that of the helper.

Can you post what you have done so far?

 

[xclusivzik]

i reached a quadratic equation that is kind of my dead end

B square +170b-3000=0

 

[Opalg]

find the positive square root of
70-20\sqrt{30}

Are you sure that you have stated the problem correctly? The number $70 - 20\sqrt{30}$ is negative, so it does not have a real square root, positive or negative.