Order of Operations:

To simplify the expression follow the order of operations: (PEMDAS)

1.      Evaluate the expressions inside the Parenthesis/Brackets (P).

2.      Evaluate Powers/Exponents (E).

3.      Multiply and/or Divide in order from left to right (MD).

4.      Add and/or Subtract in order from left to right (AS).

A simple technique for remembering the order of operations is turned into phrase

"Please Excuse My Dear Aunty Sally"

The expression is .                  

                (Replace x, y, z with 9, 4 and 12)

First operation is adding the values inside the parenthesis.

                           (Add: )

Next operation is multiplication

                                 (Multiply: )

Next operation is subtraction

                                         (Subtract: )

The value of the expression is 71.