A и B — нули функции.
C(немного левее) — вершина.
E(-0.4; f(-0.4)) = E(-0.4; 0.76)
G(2.1; f(2.1)) = G(2.1; -4.99)
F(3; f(3)) = F(3; -4)
f(x) = 6 -> H(-1.3166247903...; 6), I(5.316624790355...; 6)
f(x) = 3 -> J(-0.82842712474...; 3), K(4.82842712474...; 3)
f(x) = -2 -> L(0.26794919243...; -2), M(3.73205080756...; -2)