To find a root other than a square root of a number, a small number called the index is written above the radical sign.

Name: To find a root other than a square root of a number, a small number called the index is written above the radical sign.
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This statement is true. The index indicates which root is being taken, with the square root being the most common (index of 2). Other roots include the cube root (index of 3) and fourth root (index of 4), among others.

To Find a Root Other Than a Square Root of a Number