Question

Помогите пожалуйста

Answer 1

1) 1 + 2x = 8x²

8x² – 2x – 1 = 0

D = 2² + 4·8 = 4 + 32 = 36 = 6²

x₁ = (2 – 6) / 16 = –1/4

x₂ = (2 + 6) / 16 = 1/2

2) 20x + 25x² = –4

25x² + 20x + 4 = 0

(5x + 2)² = 0

5x + 2 = 0

x = –2/5

3) 1 – 4x² = 0

4x² = 1

x² = 1/4

x₁ = –1/2

x₂ = 1/2

4) 3x – x² = 0

x(3 – x) = 0

x₁ = 0

x₂ = 3