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-x^3+3x^2+4x-12≥0
-x^3+3x^2+4x-12≥0 /*(-1)
x^3 - 3x^2 - 4x + 12 ≤ 0
x²(x - 3) - 4(x - 3) ≤ 0
(x - 3)(x² - 4) ≤ 0
(x - 3)(x - 2)(x +2) ≤ 0
3 2 -2
++ +++
------o--------o--------o-------->
--- -2 2 ----- 3
Nas interesują wartości "ujemne"
odp. x ∈ (-oo, -2> u <2, 3>
-x²(x-3)+4(x-3)≥0
(x-3)(4-x²)≥0
(x-3)(2-x)(2+x)≥0
mz
x=3 ∨ x=2 ∨ x=-2
+++++-2 2 +++++++3 >x
- - - - - - - - - - - - - - - - -
x∈(-∞,-2>u<2,3>
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-x^3+3x^2+4x-12≥0 /*(-1)
x^3 - 3x^2 - 4x + 12 ≤ 0
x²(x - 3) - 4(x - 3) ≤ 0
(x - 3)(x² - 4) ≤ 0
(x - 3)(x - 2)(x +2) ≤ 0
3 2 -2
++ +++
------o--------o--------o-------->
--- -2 2 ----- 3
Nas interesują wartości "ujemne"
odp. x ∈ (-oo, -2> u <2, 3>
-x²(x-3)+4(x-3)≥0
(x-3)(4-x²)≥0
(x-3)(2-x)(2+x)≥0
mz
x=3 ∨ x=2 ∨ x=-2
+++++-2 2 +++++++3 >x
- - - - - - - - - - - - - - - - -
x∈(-∞,-2>u<2,3>