1) х²-5х-14 > 0
D = 25+56 = 81
x₁= 5-9 / 2 = -2
x₂= 5+9 / 2 = 7
+ - +
--------₀--------₀------->x
\\\\\\\ -2 7 /////////
2) х²-2х-35 < 0
D = 4+140 = 144
x₁ = 2-12 / 2 = -5
x₂ = 2+12 / 2 = 7
+ - +
----------₀---------₀-------->x
-5 //////// 7
\\\\\\\\\\\\\\ -2 7 /////////
------₀---------₀----------------₀------->x
-5 \\\\\\\\\\\\\\\\\\\\\\\ 7
x∈(-5; -2)