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tea74
@tea74
July 2022
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Решите номер 4 Б В пожалуйста
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oganesbagoyan
Verified answer
4б)
(x² -7)(x²+18) <0⇔x² -7<0 ⇔|x| <√7 иначе -√7 <x<√7
* * * x²+18≥18 >0 * *
x² -7<0⇔(x+√7)(x-√7) <0
+ - +
------- ( -√7) ////////// (
√7) --------
ответ :
x∈( -√7 ;
√7) .
* * * * * * * *
4в)
(x²-6x+5)(x+8) >0 ⇔(x+8)(x-1)(x-5) >0.
* * * x²-6x+5=(x-x₁)(x-x₂)=
(x-1)(x-5) * * *
- + - +
----------- (-8)//////////(1)-------(5) ///////////
ответ : x∈( -8 ;
1
∪ (5 ;∞)
.
2 votes
Thanks 1
KarinaYouchi
4.
в)(x^2-6x+5)(x+8)>0
x^2-6x+5>0 x+8>0
x^2-6x+5=0 x+8=0
x1*x2=5 x3=-8
x1+x2=6
x1=5
x2=1
x^2-6x+5=(x-5)(x-1)
(x-5)(x-1)
(x+8)
>0
- + - +
////////// ////////////
----------------(-8)-----------(1)------------------(5)-------------
Ответ:(-8;1)U(5;+∞)
б)(x^2-7)(x^2+18)<0
x^2-7<0 x^2+18<0
x^2-7=0 x^2+18=0
x^2=7 x^2=-18 - корень отрицательный, отбрасываем
x1,2=+-√7
+ - +
////////////////////////////////
--------(-√7)---------------------------(√7)----------------
Ответ:(-√7;√7)
1 votes
Thanks 1
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Answers & Comments
Verified answer
4б)(x² -7)(x²+18) <0⇔x² -7<0 ⇔|x| <√7 иначе -√7 <x<√7
* * * x²+18≥18 >0 * *
x² -7<0⇔(x+√7)(x-√7) <0
+ - +
------- ( -√7) ////////// (√7) --------
ответ : x∈( -√7 ; √7) .
* * * * * * * *
4в)
(x²-6x+5)(x+8) >0 ⇔(x+8)(x-1)(x-5) >0.
* * * x²-6x+5=(x-x₁)(x-x₂)=(x-1)(x-5) * * *
- + - +
----------- (-8)//////////(1)-------(5) ///////////
ответ : x∈( -8 ; 1∪ (5 ;∞).
в)(x^2-6x+5)(x+8)>0
x^2-6x+5>0 x+8>0
x^2-6x+5=0 x+8=0
x1*x2=5 x3=-8
x1+x2=6
x1=5
x2=1
x^2-6x+5=(x-5)(x-1)
(x-5)(x-1)(x+8)>0
- + - +
////////// ////////////
----------------(-8)-----------(1)------------------(5)-------------
Ответ:(-8;1)U(5;+∞)
б)(x^2-7)(x^2+18)<0
x^2-7<0 x^2+18<0
x^2-7=0 x^2+18=0
x^2=7 x^2=-18 - корень отрицательный, отбрасываем
x1,2=+-√7
+ - +
////////////////////////////////
--------(-√7)---------------------------(√7)----------------
Ответ:(-√7;√7)