Odpowiedź:
[tex](x + 3)(2 {x}^{2} - x + 3) = 2 {x}^{3} - {x}^{2} + 3x + 6 {x}^{2} - 3x + 9 = 2 {x}^{3} + 5 {x}^{2} + 9[/tex]
[tex](2x - y + 6)(x + 3y) = 2 {x}^{2} - xy + 6x + 6xy - 3 {y}^{2} + 18y = 2 {x}^{2} + 5xy + 6x - 3 {y}^{2} + 18y[/tex]
