Роздiл 3. Одночлени i многочлени » 579 (3-4)

3) у2 – 2(у – 5) – 4у = Зу + 10; y2 – 2y + 10 – 4y – 3y – 10 = 0; y2 – 9y = 0; y(y – 9) = 0; y = 0; y – 9 = 0; y = 9. 4) 3(m – 3) – m(3 – m) = 0; 3(m – 3) + m(m – 3) = 0; (3 + m)(m – 3) = 0; 3 + m = 0; m = –3; m – 3 = 0; m = 3.