$\"\"$

The expression is $\"\"$ . \ \

$\"\"$ (Replace x, y, z with 7, 3, 9) $\"\"$

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

1. Evaluate the expressions inside Brackets/Parenthesis (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 pf operations is turned into phrase

“Please Excuse My Dear Aunty Sally” $\"\"$

In the given expression there are no grouping symbols.

First operation is multiplication.

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

\ \

Next operation is subtraction

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

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

The value of the expression is 18.

The value of the expression is 56