Ответ:
Пошаговое объяснение:
(x-5)²+(x+7)²≥2x²
x²-10x+25+x²+14x+49-2x²≥0
4x+74≥0
4x≥ -74
x≥ -18.5
x∈[-18.5 ; +∞)
4x²+7≥24x+7
4x²+7-24x-7≥0
4x²-24x≥0
4x(x-6)≥0
4x(x-6)=0
x=0
x=6
-------------------- [0]------------------[6]----------------
+ - +
x∈(-∞;0] ∪ [6;+∞)
(-x-4)(3x+3)≥0
(-x-4)(3x+3)=0
x₁= -4
x₂ = -1
-------------------------- [-4] ------------------- [-1] ------------------------
- + -
x∈[-4;-1]
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Ответ:
Пошаговое объяснение:
(x-5)²+(x+7)²≥2x²
x²-10x+25+x²+14x+49-2x²≥0
4x+74≥0
4x≥ -74
x≥ -18.5
x∈[-18.5 ; +∞)
4x²+7≥24x+7
4x²+7-24x-7≥0
4x²-24x≥0
4x(x-6)≥0
4x(x-6)=0
x=0
x=6
-------------------- [0]------------------[6]----------------
+ - +
x∈(-∞;0] ∪ [6;+∞)
(-x-4)(3x+3)≥0
(-x-4)(3x+3)=0
x₁= -4
x₂ = -1
-------------------------- [-4] ------------------- [-1] ------------------------
- + -
x∈[-4;-1]