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Lol12526
@Lol12526
August 2021
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5x+4<9x-12
X^2+4x-21больше или меньше 0
3x^2-x+1>0
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ЕлизаветаСиянко
1)5x+4<9x-12
5x-9x<-12-4
-4x<-16
x>4
2)x^2 +4x-21>0
D=b2 -4ac =16-4×(-21)=100
x1=-b+√D / 2a = -4+10/2=4
x2=-b -√D /2a = -4 -10/2 =-7
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Answers & Comments
5x-9x<-12-4
-4x<-16
x>4
2)x^2 +4x-21>0
D=b2 -4ac =16-4×(-21)=100
x1=-b+√D / 2a = -4+10/2=4
x2=-b -√D /2a = -4 -10/2 =-7