Liczby zespolone Grap: (x - i)(2 - yi) = 11 - 23i

Bogdan: i² = -1 (x - i)(2 - yi) = 11 - 23i 2x - xyi - 2i - y = 11 - 23i (2x - y) - (xy + 2)i = 11 - 23i 1) 2x - y = 11 2) xy + 2 = 23 1) y = 2x - 11 2) x(2x - 11) - 21 = 0 → 2x² - 11x - 21 = 0 → (2x + 3)(x - 7) = 0 x = -3/2 i y = -14 lub x = 7 i y = 3