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kretipesh1
@kretipesh1
June 2022
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СРОЧНО НУЖНА ПОМОЩЬ!!ПОМОГИТЕ!!
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m11m
F(x)' =
-(x²+7) - 2x(2-x)
=
-x² -7 -4x+2x²
=
x² -4x -7
(x² +7)² (x² +7)² (x² +7)²
x² -4x -7
>0
(x² +7)²
(x² +7)² >0 при любом х.
x² -4x-7>0
x²-4x-7=0
D=16+28=44
x₁ =
4-√44
=
4 - 2√11
= 2 - √11
2 2
x₂ = 2 + √11
+ - +
------------
2-√11 ------------- 2+√11
-------------
\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\
x∈(-∞; 2-√11)U(2+√11; +∞)
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Answers & Comments
(x² +7)² (x² +7)² (x² +7)²
x² -4x -7 >0
(x² +7)²
(x² +7)² >0 при любом х.
x² -4x-7>0
x²-4x-7=0
D=16+28=44
x₁ = 4-√44 = 4 - 2√11 = 2 - √11
2 2
x₂ = 2 + √11
+ - +
------------ 2-√11 ------------- 2+√11 -------------
\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\
x∈(-∞; 2-√11)U(2+√11; +∞)