25a²-5a-b²-b

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25a²-5a-b²-b25a²-5a-b²-b25a²-5a-b²-b25a²-5a-b²-b=(5a-b)(5a+b

25a²-5a-b²-b
25a²-5a-b²-b

25a²-5a-b²-b
25a²-5a-b²-b
=(5a-b)(5a+b)-(5a+b)
=(5a+b)(5a-b-1)