$\"\"$

The expression is $\"\"$ .

The general factor trinomial form is $\"\"$ .

In the above trinomial, $\"\"$ .

Since c is positive and b is positive, you need to find two positive factors with a sum of 16 and product of 63.

Make an organized list of the factors of 63, and look for the pair of factors with a sum of 16.

$\"\"$

Apply the pattern form: $\"\"$ when $\"\"$ .

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

The factor form of expression is $\"\"$ .