x1 = 12.6
x2 = -14.4
Пошаговое объяснение:
(4х + 21)(1,8 – 0,3х) = 0
7.2x - 1.2x2 + 37.8 - 6.3x = 0
-1.2x2 + 0.9x + 37.8 = 0
D = 0.81 + 181.44 = 182.25 = 13.5
x1 = -0,9 + 13,5 = 12,6
x2 = -0.9 - 13.5 = -14.4
x1 = 12.6
x2 = -14.4
Пошаговое объяснение:
(4х + 21)(1,8 – 0,3х) = 0
7.2x - 1.2x2 + 37.8 - 6.3x = 0
-1.2x2 + 0.9x + 37.8 = 0
D = 0.81 + 181.44 = 182.25 = 13.5
x1 = -0,9 + 13,5 = 12,6
x2 = -0.9 - 13.5 = -14.4