А) 2х^2+8х+15=0 б) 6х^2+х=0 в) 8-9х^2=0
2x² + 8x + 15 = 0 D/4 = 16 - 15 * 2 < 0 x ∉R 6x² + x = 0 x(6x + 1) = 0 x₁ = 0 6x + 1 = 0 6x = -1 x₂= -1/6 Ответ: -1/6; 0 8 - 9x² = 0 9x² = 8 x² = 8/9 x = ± √8/3 = ±2√3/3 Ответ: