Two terms, each of them squared, 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)
Two terms, each of them squared, 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)