📐 Matematika · Kvadrat tenglama · ★★☆
x₁ va x₂ — x² + 3x − 5 = 0 tenglamaning ildizlari. x₁² + x₂² ni toping.
- A)−1
- B)9
- C)19
- D)14
👀 To'g'ri javob va tushuntirishni ko'rish
✓ C) 19
💡 x₁ + x₂ = −3, x₁x₂ = −5; x₁² + x₂² = (x₁ + x₂)² − 2x₁x₂ = 9 + 10 = 19.