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x2 - y2 = (x + y).(x - y)
b2 - 1 = (b + 1).(b - 1)
x2 - 9/25 = (x + 3/5).(x - 3/5)
x6 - 4 = (x3 + 2).(x3 - 2)
espero te sirva.