parenthesis. For example, ( 4 + 5 ) - 2
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partheses because that the first order of operation
Parenthesis
In a standard calculation it would be the exponent, also known as the power of. However, the use of brackets can change the order of operations and so sometimes another operation could be done first. Exponents should be processed first, then multiplication and division, then addition and subtraction. The use of parenthesis brackets can be used to override this default precedence order.
There is no known origin of the order of operations or PEMDAS. PEMDAS is considered as the proper way to tackle a given mathematical expression in terms of what operation should be performed first.
If you are asking 'in what order are arithmetic operations performed'; One useful mnemonic is BEDMAS. This order is Brackets, Exponents, Division, Multiplication, Addition, and Subtraction. Sometimes called Order of Operations.