What is the square root of 400?

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answer is A.

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Detailed Solution

The given number is 400.
Now, using prime factorization, represent the supplied number as a product of the prime factors, and create the pairs of related factors such that the two factors in each pair are equal.

\Rightarrow 400 = 2 \times 2 \times 5 \times 2 \times 2 \times 5

\Rightarrow 400 = 20 \times 20

⇒ 400 = 20 × 20 = 20

Therefore, the square root value of 400 is 20.
Hence, option 1 is correct.

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