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4x²+10x+25 = (2x+5)²
a=2x b=5 odp. 2x³-5³ odpowiedz 8x³ - 125
teraz sprawdzenie
(2x)³-5³ = (2x-5)(2x² + 2x*5 + 5²)
(2x)³-5³ = (2x-5)(2x² + 10x + 25)