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Brick123
Hello!

You can solve for x by subtracting 11 from 15 to get 4. Once you've got 4, you can power 4 by 2 (4²) to get 16 as your answer

x=16

So the value of x is 16
 
I hope this helps!
jcherry99
Remark
I take it you want to find x.

Square both sides.
(sqrt(x + 11))^2 = (15)^2
 x + 11 = 225  Subtract 11 from both sides.
x = 225 - 11
x = 214

Edit
This answer is edited to reflect which interpretation is correct. If you give out Brainlys (and you should) give it to Brick123. We all need them.

Sqrt(x) + 11 = 15   Subtract 11 from both sides.
sqrt(x) = 15 - 11
sqrt(x) = 4             Square both sides.
(sqrt(x)^2 = 4^2
x = 16