$\"\"$

The polynomial expression is $\"\"$ .

To find the G.C.F in above binomial expression $\"\"$ .

Factors of $\"\"$ : 2,4, a, a².

Factors of $\"\"$ : 2, 3, 4, 6, 9, 12, 18, 36, b, b².

Then the G.C.F is 2, 4 = 4.

$\"\"$

Combine like terms using distributive property: $\"\"$ .

$\"\"$

Apply deference of squares formula: $\"\"$ .

$\"\"$

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

The solution is $\"\"$ .