Вправи: 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.