Two terms that are squared and separated by a subtraction sign like this:
a2 − b2
Useful because it can be factored into (a+b)(a−b):
a2 − b2 = (a+b)(a−b)
a2 − b2
Useful because it can be factored into (a+b)(a−b):
a2 − b2 = (a+b)(a−b)
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