Question

10 x^2 - x - 60 = 0 решите уравнение

Answer 1

$10x^2 - x - 60 = 0\\a = 10,;;b = -1, ;;c = -60\\D = b^2 - 4ac\\D = 1 + 2400 = 2401;;;sqrt D = 49\\x_{1,2} = frac{-bpm sqrt D}{2a}\\x_1 = frac{1+49}{20} = frac{5}{2} = 2.5\\x_2 = -frac{48}{20} = -2frac{4}{10} = -2.4$