X^2+3x+m=0 найдите x1 x2 m-? x1-x2=6 решить

X^2 +3x + m = 0
x1 - x2 = 6

по т. Виетта
x1 + x2 = -3
x1 * x2 = m

x1 - x2 = 6
x1 + x2 = -3
суммируем

2x1 = 3
x1 = 1.5
x2 = -4.5

m = x1 * x2 = 1.5 * (-4.5) = -6.75