You should always try to factor out any common monomial factor and then you try to factor the rest of the problem.
	Examples
	1. (This is the sum of two cubes)
	 (Use the formula in objective 1)
	
	

	2.	(This is the difference of two cubes)
		(Use the formula in objective 1)
	

	3. 	(You can factor out 3 here)
		(This is the difference of two cubes)
	
	
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