The square root of 421.875 is 7.5
The square root of 7.5 is 2.7386128
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no, 28 has no whole square root; the square root of 49 is 7
the square root of 49 equals 7
It is an irrational number and lies between 6 and 7
It is: the square root of 7 times the square root of 7 = 7
Nothing. You cannot have a square root of a negative number. The square root of negative one is called i, but i is an imaginary number. It does not exist and does not follow the properties of real numbers. (For example, if a and b are positive, then the square root of a times the square root of b is the square root of ab. But the square root of -7 is not the square root of 7 times i.)