Think about the back of sit-com couches or the couch in your grandma's house. What is almost always folded neatly on the sofa back, or stacked in linen closets and hope chests? A granny square afghan.
If you notice that the first term is a perfect square, and the second term is a perfect square, and you have a negative here, we can say that it is "the difference of two squares." What we want to do ...
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