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 n√9, 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.