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) = ±21
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4.6 is a better approximation to the square root of 21.
21
(√(a))²=a The square root and the square cancel to leave just 49/21■
21 times the square root of 5.
There is no exact value for the square root of 21. √21 = 4.5825757 (7dp)