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irrational, it has a never ending decimal

Q: The square root of 21 is it rational or irrational?

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The square root of 21 is 4.58257569495584.

21The square root of 441 is 21

It isn't. √22 + √23 = 9.486. √21 + √24 =9.482. its not that its more than that!!! its..... NOTHING!!! you got that??? NOTHING at all!!!

441 has two square roots; 21 or -21.

Expressed as a surd, the square root of 84 is equal to 2 sqrt (21). √84 = √(4 x 21) = √4√21 = 2√21

Related questions

irrational

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

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

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

No, they are not.

Yes, as is the positive square root.

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

0.8095

Yes because 21 is a rational number

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

the square root of 21

21 is a rational number.