The radical sign (√) indicates the square root or nth root of a number. When used without a specified index, it typically represents the square root, which is the value that, when multiplied by itself, gives the original number. For example:

- \( \sqrt{9} = 3 \) because \( 3 \times 3 = 9 \).
  
If the radical sign has an index (n) like \( \sqrt[n]{x} \), it indicates the nth root. For example:

- \( \sqrt[3]{27} = 3 \) because \( 3 \times 3 \times 3 = 27 \).

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### Related Questions:
1. What is the difference between square root and cube root?
2. How do you simplify expressions involving radicals?
3. Can negative numbers have real square roots?
4. How do you rationalize the denominator with radicals?
5. What are the properties of radicals?

**Tip:** Always remember that the square root of a positive number has two solutions: a positive and a negative value (e.g., \( \sqrt{9} = \pm 3 \)).

Explore the meaning and usage of the radical sign (√) in mathematics. Learn about its representation of square roots and nth roots, with examples like √9 = 3 and ∛27 = 3. Suitable for Grades 7-9 students looking to understand basic mathematical concepts.

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