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**Hint**: Square Root: A square root of a number is a value that can be multiplied by itself to give the original number. It is a function of $ y = \sqrt x $ . The principal square root is the positive number square root. Unless “the square root of a number refers only to the principal square root. The square root is usually denoted as $ '\sqrt {} ' $ and it is known as a radical symbol.

**Complete step by step solution:**

Given,

First of all we have to factorize the number \[200\] ,

$ \Rightarrow 200 = 2 \times 2 \times 2 \times 5 \times 5 $

Now we have to make the set and take out the radical.

The square root of given number is,

$ = \sqrt {200} $

by factrosing it,

$ = \sqrt {25 \times 8} $

$ = \sqrt {5 \times 5 \times 2 \times 2 \times 2} $

Now make the set and take out from the radical.

$ = 5 \times 2\sqrt 2 $

$ = 10\sqrt 2 $

**So, the correct answer is “ $ 10\sqrt 2 $ ”.**

**Note**: The square root property is the one method to solve the quadratic equations. The method is generally used in equations that have the form $ a{x^2} = c $ or $ {(ax + b)^2} = c $ the equation which can be expressed on either of those forms. We can take square roots from both sides. The square root of a negative number is known as a complex number.

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