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below), which is denoted by where the symbol ? is called the radical, among other names, and the line over the number is called the vinculum (sometimes considered a part of the radical symbol itself). For example, to express the fact that the principal square root of 9 is 3, we write . The term (or number) whose square root is being considered is known as the radicand. The radicand is the number or expression underneath the radical sign, in this case, 9. For

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