Find the square root of 81 .

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answer is A.

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Detailed Solution

Concept- We attempt to build the number as a power of a digit. We convert 81 to the power of three. Then we use the indices theorem.

to use algebra to get the root value We may also use an elementary approach to get the root by selecting only one prime out of two comparable primes.
Finding the root of 81 is necessary.
If the root of the digit

then we can say

.
To find the root, we need to find the prime factorization of 81.
So,

. So, to find the root value, take one similar prime number of 2 .

We know that

.
We also can use indices where

.
Hence, the correct option is 1.

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