A decimal approx. - rounded to 2 decimal places would be 6.47
In root notation, however, this can be simplified to 2 + 2√5
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There is no square root of -75. If it's 75, that is 5 square root 3.
-21 and -20, or 20 and 21.
There is no true answer to the square root of twenty, Because you can't multiply two of the same numbers to make twenty.
42 is 16, less than 20 52 is 25, more than 20. so, 20 is not a perfect square, and does not have an integral square root. But, the square root of any integer is either an integer itself, or irrational. So, square root 20 is irrational
20 is not the square of an integer, the square root of 20 is approximately equal to 4.472.