<span>x^2 + 10x + 22 = 0</span>
D = 10^2 - 4*22 = 100 - 88 = 12
√D = √4*3 = 2√3
x₁ = ( - 10 + 2√3)/2 = - 5 + √3
x₂ = ( - 10 - 2√3)/2 = - 5 - √3
172......................
х²-5х-14>0
y=х²-5х-14
х²-5х-14=0
D=25+56=81
x1=(5+9)/2=7 x2=(5-9)/2=-2
____+_____ -2_____-____7____+____
x∈(- ∞ -5) (-5 -2)∨(7 ∞)