Need help with this simple equation!!

[kmj764]

What's the result of (√11+2√10)^2 - (√11-2√10)^2 where 2√10 is inside the square root of 11? That is to say, it is a double radical sign, which is confusing me. I don't know how to type the double radical sign. :???:

Thanks in advance.

 

[pka]

What's the result of (√11+2√10)^2 - (√11-2√10)^2 where 2√10 is inside the square root of 11? That is to say, it is a double radical sign, which is confusing me. I don't know how to type the double radical sign.

\(\displaystyle \left(\sqrt{11+2\sqrt{10}}\right)^2=11+2\sqrt{10}.\)

 

[kmj764]

hmm

Thanks a lot

 

[soroban]

Hello, kmj764!

What's the result of (√11+2√10)^2 - (√11-2√10)^2 where 2√10 is inside the square root of 11?
That is to say, it is a double radical sign, which is confusing me.
I don't know how to type the double radical sign.

You need to type: . [√(11 + 2√10)]^2 - [√(11 - 2√10)]^2