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Duck26
@Duck26
July 2022
1
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Решите пожалуйста неравенства !
А,В,Д
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NeZeRAvix
Verified answer
А)
x^2-3x-4<0
x^2-3x-4=0
D=9+16=25=5^2
x1=3-5/2=-1
x2=3+5/2=4
+ -1 - 4 +
___________.___________.___________ x
Ответ: (-1; 4)
в)
2x^2>3x
2x^2-3x>0
x(2x-3)>0
x(2x-3)=0
x=0
2x-3=0
x=1,5
+ 0 - 1,5 +
_____________.______________._______________
Ответ:(-∞;0)U(1,5;+
∞)
д)
x^2+4x+14>0
x^2+4x+14=0
D=16-56=-40
a=1
x
∈R
Ответ: (-
∞;+
∞)
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Duck26
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Answers & Comments
Verified answer
А)x^2-3x-4<0
x^2-3x-4=0
D=9+16=25=5^2
x1=3-5/2=-1
x2=3+5/2=4
+ -1 - 4 +
___________.___________.___________ x
Ответ: (-1; 4)
в)
2x^2>3x
2x^2-3x>0
x(2x-3)>0
x(2x-3)=0
x=0
2x-3=0
x=1,5
+ 0 - 1,5 +
_____________.______________._______________
Ответ:(-∞;0)U(1,5;+∞)
д)
x^2+4x+14>0
x^2+4x+14=0
D=16-56=-40
a=1
x∈R
Ответ: (-∞;+∞)