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 = 9, and z = 12) $\"\"$

According order of operations inside the grouping symbols should be evaluated first.

First operation is multiply the values inside the parenthesis.

$\"\"$ (Multiply: $\"\"$ )

Next operation is subtraction.

$\"\"$ (Subtract: $\"\"$ ) $\"\"$

Next operation is multiplication.

$\"\"$ (Multiply: $\"\"$ )

Next operation is subtraction.

$\"\"$ (Subtract: $\"\"$ )

Next operation is addition.

$\"\"$ (Add: $\"\"$ ) $\"\"$

The value of the expression is $\"\"$ .