$\"\"$

The expression is $\"\"$ .

Subtract the polynomials horizontally

$\"\"$ (Multiply the second polynomial with negative sign)

$\"\"$ (Group like terms)

$\"\"$ (Apply additive inverse property: $\"\"$ )

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

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

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