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Radical

Radical

Name given to a numerical ou algebraic expression expressed using the symbol 9 or n9.

Educational notes

  • The 9 symbol is also called a “radical”, but has no meaning on its own.
  • The 9 symbol is read as “radical” or “positive square root of…”
  • In the expression n9, the number n is called the index of the radical; the expression is called a radical of order n.
    The horizontal bar that groups the radicand is called the vinculum.
  • Similar radicals are radicals with the same index or the same order.
  • Christoff Rudolff is credited with having introduced the radical symbol.

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