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There is no real number [square] root of a negative number. There is a real cube root and a real fiftth root etc, but root, by itself, implies square root.
The square root is the number which is times by itself, to get the square number.
the square root of a number is the number that is multiplied by itself to get that number, for example the square root of 9 is 3
Cube Root - The number that produces a given number when cubed Square Root - A number that produces a specified quantity when multiplied by itself: "7 is a square root of 49".
The root number for 11 is both "1" and "11."