Помогите плиз срочно

.01

4x² + 3x + 8 = 0 — a = 4; b = 3; c = 8,
D = b² – 4ac = 3² – 4 • 4 • 8 = 9 – 128 = –119.

–x² + 7x – 18 = 0 — a = –1; b = 7; c = –18,
D = b² – 4ac = 7² – 4 • (–1) • (–18) = 49 – 72 = –23.

9x² + 6x + 1 = 0 — a = 9; b = 6; c = 1,
D = b² – 4ac = 6² – 4 • 9 • 1 = 36 – 36 = 0.

.02

x² – 18x + 81 = 0 — a = 1; b = –18; c = 81,
D = b² – 4ac = (–18)² – 4 • 1 • 81 = 324 – 324 = 0; 1 корень.

Ответ: 1 корень.

x² – 8x + 81 = 0 — a = 1; b = –8; c = 81,
D = b² – 4ac = (–8)² – 4 • 1 • 81 = 64 – 324 = –260 < 0; нет корней.

Ответ: нет корней.

.03

2x² – 5x + 2 = 0 — a = 2; b = –5; c = 2,
D = b² – 4ac = (–5)² – 4 • 2 • 2 = 9 > 0; 2 корня,
x₁ = (–(–5) + √9)/(2 • 2) = 2,
x₂ = (–(–5) – √9)/(2 • 2) = 0,5.

Ответ: 0,5; 2.

номер 1. а) -119, б) -23, в) 0
номер2. а) D=0 ,один корень, б)D=-260, нет корней
номер3. .