
Arturo O. answered 03/31/20
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25x2 - 1 = (5x)2 - 12 = (5x - 1)(5x + 1)
Therefore,
(25x2 - 1) + (5x +1 )2 = (5x - 1)(5x + 1) + (5x +1 )2 = (5x + 1)[(5x - 1) + (5x + 1)] = (5x + 1)(10x) = 10x(5x + 1)