Q: Is the square root of 21 a rational number?

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No because it is 2 times the square root of 21 which is an irrational numberThe square root of 84 is not a rational number

Yes because 21 is a rational number

irrational

It is equal to 21/2 which is a rational number

No, they are not.

irrational, it has a never ending decimal

It is: 2 times the square root of 21 and it's an irrational number

21 is a rational number.

The square root of 21 is 4.58257569495584.

The square root of 21 is 4.58257569495584.

First note that 84=4x21 and 4 is a perfect square. So square root of (84)=square root (4x21)=Square root (4) Square root (21)= 2 multiplied by the square root of 21. You can also write this using rational exponents, but this is not in radical form. It is an equivalent expression, however. 2 x (21)1/2

Yes. The square root of a natural number (positive integer) is either an integer, or an irrational number.

The square roots of 21 are 4.5826 (rounded) and the negative of the same number.

Yes, albeit an irrational number

The square root of -21 is: 4.582576 i

21The square root of 441 is 21

4.6 is a better approximation to the square root of 21.

the square root of 21

21 times the square root of 5.

If the reverse square root of the reverse of square of a number is the number itself then it is Adam Number. For ex., 12 and 21 Take 12 square of 12 = 144 reverse of square of 12 = 441 square root of the reverse of square of 12 = 21 The reverse square root of the reverse of square of 12 = 12, then number itself. Such number is called Adam Number. cool....................

Your answer is: 17.7482393

The square root and square functions are inverse of one another EXCEPT that square root is not really a function: it is a 1-to-many mapping. So sqrt(square(21)) = sqrt(441) = Â±21

Yes, as is the positive square root.

Root 64 is 8, if by root you mean the square root. Then the problem become -square root 84(6+8) which is the - square root of 84(14) But square root of 84 is 2(square root of 21) so the final answer comes from -2(square root 21)x14 which is -28square root (21)

If you mean 84 squared then it is 84*84 = 7056 If you mean the square root of 84 then it is 2 times the square root of 21 which is an irrational number

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