$\"\"$

The expression is $\"\"$ .

$\"\"$ (Apply distributive property: $\"\"$ )

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

$\"\"$ (Product of two opposite signs is positive)

$\"\"$ (Grouping like terms)

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

The difference of $\"\"$ is $\"\"$ .