x^2 - 3x - 10 = 0
D = 3^2 - 4 × 1 × (-10) = 9 + 40 = 49.
x1 = 3 + корень с 49 / 2 × 1 = 3 +7 / 2 = 10/2 = 5.
х2 = 3-7 / 2×1 = -4/2 = -2
D=b^2-4ac=9+40=49
x1=(3+7)/2=10/2=5
x2=(3-7)/2=-4/2=-2
ОТВЕТ: х= -2 или 5
x^2 - 3x - 10 = 0
D = 3^2 - 4 × 1 × (-10) = 9 + 40 = 49.
x1 = 3 + корень с 49 / 2 × 1 = 3 +7 / 2 = 10/2 = 5.
х2 = 3-7 / 2×1 = -4/2 = -2