Вправи 888 - 1000 » 967 (г)

г) 12(3 – x) = (3x – 2)2; 36 – 12x = 9x2 – 6x + 1; 9x2 – 6x + 1 – 36 + 12x = 0; 9x2 + 6x – 35 = 0; x = (-3 ± √(9+315))/9 = (-3 ± 18)/9; x1 = (-3+18)/9 = 15/9 = 5/3 = 12/3; x2 = (-3-18)/9 = –21/3; Відповідь: 12/3; –21/3.