The product of (a + b)(a − b) is a2 − b2.

Sometimes
Always
Never
Please explain so I can understand this a bit more.

Question

The product of (a + b)(a − b) is a2 − b2.
 	
	Sometimes
	Always
	Never
Please explain so I can understand this a bit more.

jdoe0001 · Answer

well  use the FOIL method to see if it's only sometimes or never

anonymous · Answer

what about the a2-b2?

zzr0ck3r · Answer

@xspoon do you know how to do the F.O.I.L method of expansion?

anonymous · Answer

Well, when you foil it out then it would be a2 + 2ab - 2ab +b2 and then the middle values would cancel out.

zzr0ck3r · Answer

and notice in doing this we never put in stipulations on a,b. We never divided by a or b, so we dont have to worry about them not being 0....ect. 

so this must always be true.