a)
-2(x - 3)(x + 1) > 0
M. zerowe:
(x + 1)(x - 3) = 0
x₁ = -1, x₂ = 3
a < 0, to parabola zwrócona jest ramionami do dołu
x ∈ (-1; 3)
b)
-5(x - 2)(x - 5) < 0
M. zerowe
(x - 2)(x - 5) = 0
x₁ = 2, x₂ = 5
a < 0, parabola zwrócona jest ramionami do dołu:
x ∈ (-∞; 2) ∪ (5; +∞)
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a)
-2(x - 3)(x + 1) > 0
M. zerowe:
(x + 1)(x - 3) = 0
x₁ = -1, x₂ = 3
a < 0, to parabola zwrócona jest ramionami do dołu
x ∈ (-1; 3)
b)
-5(x - 2)(x - 5) < 0
M. zerowe
(x - 2)(x - 5) = 0
x₁ = 2, x₂ = 5
a < 0, parabola zwrócona jest ramionami do dołu:
x ∈ (-∞; 2) ∪ (5; +∞)