По теореме Виета x1 + x2 = 4, x1 * x2 = b
2x1 + 3x2 = 5
2(x1 + x2) + x2 = 5
2 * 4 + x2 = 5
x2 = -3
x1 = 4 - x2 = 7
b = x1 * x2 = 7 * (-3) = -21
По теореме Виета x1 + x2 = 4, x1 * x2 = b
2x1 + 3x2 = 5
2(x1 + x2) + x2 = 5
2 * 4 + x2 = 5
x2 = -3
x1 = 4 - x2 = 7
b = x1 * x2 = 7 * (-3) = -21