Вправи 1001 - 1100 » 1027

1027. Розв’яжи рівняння. a) y2 + 5y – 14 = 0; y1 + y2 = –5; y1 • y2 = –14. y1 = –7; y2 = 2. б) z2 – 2z – 15 = 0; z1 + z2 = 2; z1 • z2 = –15. z1 = –3; z2 = 5. в) c2 – 2c – 8 = 0; c1 + c2 = 2; c1 • c2 = –8. c1 = 4; c2 = –2. г) t2 + 9t – 10 = 0; t1 + t2 = –9; t1 • t2 = –10. t1 = –10; t2 = 1.