Most Common Algebra Mistake

So many people miss this problem. Like, it happens all the time. Take a look.

WRONG!

This one is not right. Did you catch the error? Here it is worked correctly. Start off by writing it twice.

You could think of it as FOILing.

Or you could think of it as double-distributive.

Or you could think of it as multiplying all the terms in every combination.

Just remember Algebra is in the deets so be alert.