Intuitively 20.5is between 10.5 and 40.5. Since these values are 1 and 2 respectively 20.5 must be between 1 and 2. However since the roots to each of these numbers can be either posative (+) or negative (-) the roots can lie on either side of the 0. The answer is then that the root of two can be greater than -2 and less than -1, or less than +2 and greater than +1.
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The opposite of a square root is the square of a number. In mathematical terms, if the square root of a number x is denoted as √x, then the opposite of the square root (√x) is x itself. This is because squaring a number undoes taking the square root of that number.
The square root of 648 is 18 times the square root of 2. 648 has no perfect square root.
The square root of 4 is 2. 2 is a rational number so they square root of 4 is rational.