$\"\"$

The expression is $\"\"$ .

Substitute a = 4 and b = 8 In the given expression.

$\"\"$

In the given expression there are no grouping symbols.

First operation is multiplication.

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

Next operation is addition.

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

$\"\"$