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Q: Is negative square root of 21 irrational?

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irrational

0.8095

irrational, it has a never ending decimal

No. The square root of an integer is either an integer, or an irrational number.

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

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

the square root of 21

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, albeit an irrational number

The numbers are: 3 +square root 21 and 3 -square root 21

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

Yes. It would be 21/2 * 91/2, or "three root two". Root two is an irrational number, so it's products - such as root 18, will be as well.

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

the square root of 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

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)

The square root of 21 is 4.58257569495584.

The square root of 21 is 4.58257569495584.

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.

21 times the square root of 5.

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

(√(a))²=a The square root and the square cancel to leave just 49/21■