у² - 9у + 14 = 0
D = b² - 4ac = (-9)² - 4 · 1 · 14 = 81 - 56 = 25
√D = √25 = 5
х₁ = (9-5)/(2·1) = 4/2 = 2
х₂ = (9+5)/(2·1) = 14/2 = 7
ответ: х₁ = 2; х₂ = 7.
Y1=(9+√25)/2=(9+5)/2=14/2=7
Y2=(9-√25)/2=(9-5)/2=4/2=2
Y1=7;. Y2=2
