Grouping symbols frequently used to isolate operations.

- Parentheses are always used in pairs.
- In a sequence of operations, we solve the operations in parentheses first. Parentheses help to set a certain order in which to solve the operations.
- We also use parentheses to group together two elements used to locate a point on a cartesian plane, such as the point A (2, 6).

### Notation

The symbols for parentheses are “(” and “)”.

### Examples

Use of parentheses in an operation: 7 + 4(3 + 2) – 2(6 + 5)

Use of parentheses in an operation: * x* + 3(*x* + 1) + 5(*x* + 2) = 22

### Historical Note

The first person to use parentheses to isolate mathematical expressions was Christopher Clavius (1537-1612), a Jesuit student of Johannes Kepler (1571-1630). He was the mathematician of Pope Gregory XIII. The French mathematician François Viète (1540-1603) was the first to use them in his book *Zeletica*, published in 1593.