$\"\"$

The expression is $\"\"$ .

To find the coefficients of the x-terms, the product of $\"\"$ or $\"\"$ , and a sum of $\"\"$ .

The two coefficients must be $\"\"$ and 4 since $\"\"$ .

$\"\"$ (Substitute $\"\"$ x + 4x for $\"\"$ x)

Take out common factor.

$\"\"$

$\"\"$ $\"\"$

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