Роздiл 3. Одночлени i многочлени » 493 (5-6)
5) (Зx + 1)(3x – 1) = 9x2 + x; 9х2 – 1 – 9х2 – х = 0; х = –1. 6) (6x + 1)(6x – 1) = (4х + 1)(9x – 1); 36х2 – 1 = 36х2 – 4х + 9х – 1; 36х2 – 36х2 – 5х = 1 – 1; –5х = 0; х = 0.
5) (Зx + 1)(3x – 1) = 9x2 + x; 9х2 – 1 – 9х2 – х = 0; х = –1. 6) (6x + 1)(6x – 1) = (4х + 1)(9x – 1); 36х2 – 1 = 36х2 – 4х + 9х – 1; 36х2 – 36х2 – 5х = 1 – 1; –5х = 0; х = 0.