$\"\"$

The polynomial is $\"\"$ .

Horizontal method:

Subtract $\"\"$ by adding its additive inverse.

The additive inverse of $\"\"$ is $\"\"$ .

$\"\"$

Group like terms.

$\"\"$

Combine like terms.

$\"\"$ . $\"\"$

Vertical method:

Align like terms in columns and subtract by adding the additive inverse.

$\"\"$ .

$\"\"$

The value of $\"\"$ .