$\"\"$

The expression is $\"\"$ .

$\"\"$ (Write $\"\"$ )

$\"\"$ (Apply commutative property of multiplication: $\"\"$ )

$\"\"$ (The product of two same signs is positive)

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

$\"\"$ (Apply commutative property of multiplication: $\"\"$ )

$\"\"$ (The product of two different signs is positive)

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

The solution is $\"\"$ .