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Q.

What is the square root of 400?


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a

20

b

40

c

100

d

4 

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.
⇒400=2×2×5×2×2×5
⇒400=20×20
⇒ 400 = 20×20 =20  
Therefore, the square root value of 400 is 20.
Hence, option 1 is correct.
 
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