Odpowiedź:
[tex](2x - 9)(2x + 9) = 4x {}^{2} + 18x - 18x + 81 = 4 {x}^{2} + x + 81 \\ (3x - {4}^{2} ) = 3x - 16 \\ (5x - 2)^{2} = 25x + 4 - 20x[/tex]
