Plug in value of extit{r}: First, let's plug in the value of extit{r} into the expression. So we got extit{r} = 9, and we put it in extit{sqrt}(4 extit{r}).Calculation: extit{sqrt}(4 imes 9)
Calculate inside square root: Now, we gotta multiply 4 by 9 to see what's inside the square root.Calculation: 36
Find square root of 36: Alright, the square root of 36 is just 6, easy peasy.Calculation: 36=6