Plug in value of extit{u}: First, let's plug in the value of extit{u} into the expression. So we got extit{u} = 4, and we put it in extit{sqrt}(16 extit{u}).Calculation: extit{sqrt}(16 extit{*}4)
Multiply to simplify: Now, we gotta multiply 16 by 4 to simplify what's inside the square root.Calculation: 64
Find the square root: Alright, the square root of 64 is 8, so that's our answer.Calculation: 64=8