а) 7x^2+16x+4>0, 7x^2+16x+4=0 x=(-8+-√(64-28))/7=(-8+-6)/7
x1=-2 x2=-2/7 x<-=2 U x>-2/7
3x=<0 x<=0
(-∞;-2) U (-2/7;0]
б)x-1/x-6=<0, (x-1)/(x-6)<=0 ___+1-6___+
[1;6]
x+1>=0 x>=-1
x>=-1 ∩ [1;6] = [1;6]
а) 7x^2+16x+4>0, 7x^2+16x+4=0 x=(-8+-√(64-28))/7=(-8+-6)/7
x1=-2 x2=-2/7 x<-=2 U x>-2/7
3x=<0 x<=0
(-∞;-2) U (-2/7;0]
б)x-1/x-6=<0, (x-1)/(x-6)<=0 ___+1-6___+
[1;6]
x+1>=0 x>=-1
x>=-1 ∩ [1;6] = [1;6]