$\"\"$

The polynomial is $\"\"$ .

$\"\"$ (Substitute 2 for a)

$\"\"$ (Evaluate power: $\"\"$ )

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

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

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

The value of $\"\"$ is 7 when $\"\"$ .