4.58
4/ 21 .00 00
-16
85 / 5 00
-425
908 / 75 00
-7264
336
square root of 21 till 2 decimal places
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5 times the square root of 21
sqrt(441) = 21.
4.6 is a better approximation to the square root of 21.
21
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