Explain what the Difference of Squares (DOS) to the 4th degree is

Every difference of squares problem can be factored as follows: a2 - b2 = (a + b) (a - b) or (a - b) (a + b). So, all you need to do to factor these types of problems is to determine what numbers squares will produce the desired results. Step 3: Determine if the remaining factors can be factored any further.