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(2x - 5)(2x - 5)
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16x2 + 40x + 25 = 16x2 + 20x + 20x + 25 = 4x(4x + 5) + 5(4x + 5) = (4x + 5)(4x + 5) = (4x + 5)2
(2x + 5)(6x - 5)
... You have to know what x and y are first.
2x + 5 = 25 2x = 20x = 10
4n-20n+25