R is a positive number. It is multiplied by 8 and then squared. The square is no

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Question

R is a positive number. It is multiplied by 8 and then squared. The square is now divided by 4 and the square root is taken. The result of the square root is Q. What is the value of Q ?

Options:

A . 3R

B . 4R

C . 7R

D . 9R

Answer: Option B
$$\eqalign{
& \Rightarrow {\text{Q}} = \sqrt {\frac{{{{\left( {8{\text{R}}} \right)}^2}}}{4}} \cr
& \Rightarrow {\text{Q}} = \frac{{\sqrt {{{\left( {8{\text{R}}} \right)}^2}} }}{{\sqrt 4 }} \cr
& \Rightarrow {\text{Q}} = \frac{{8{\text{R}}}}{2} \cr
& \Rightarrow {\text{Q}} = 4{\text{R}} \cr} $$

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