1) D=13²+4*3*10=289, √D=17 , x₁=(-13-17)/6=-5, x₂=4/6=2/3
2) 5/(x-3) -8/x -3=0 ОДЗ: х≠0 , х≠3
(5х-8х+24-3х²+9х) /х(х-3) =0
-3х²+6х+24=0
х²-2х-12=0 , D=4+4*12=4+48=52 ,. √D=√52=2√13
x₁=(2-2√13) /2=1-√13
x₂=1+√13
3) ...18-8x+16-10+4x<0
-4x+24<0 , 4x>-24 , x> -6
4).....3(x-6)-4x-2*12≥0
3x-18-4x-24≥0
-x-42≥0
x≤-42
2. a) 3x^2+13x-10=0
D=169+120=289
x1=(-13-17)/6=-30/6=-5
x2=(-13+17)/6=4/6=2/3
b) 5/(x-3) - 8/x=3
составим систему
sistema x-3 ne raven 0
x ne raven 0
5x-8x+24=3x^2-9x
sistema x ne raven 3
3x^2-6x-24=0
x^3-2x-8=0
D=4+32=36
x1=(2-6)/2=-2
x2=(2+6)/2=4
resheniemsistemy budet x {-2,4}
3. a) 18-8(x-2)<10-4x
18-8x+16<10-4x
34-8x<10-4x
-4x<-24
x>6
b) (x-6)/4 - x/3>=2
3x-18-4x>=24
-x>=42
x<=-42
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Answers & Comments
1) D=13²+4*3*10=289, √D=17 , x₁=(-13-17)/6=-5, x₂=4/6=2/3
2) 5/(x-3) -8/x -3=0 ОДЗ: х≠0 , х≠3
(5х-8х+24-3х²+9х) /х(х-3) =0
-3х²+6х+24=0
х²-2х-12=0 , D=4+4*12=4+48=52 ,. √D=√52=2√13
x₁=(2-2√13) /2=1-√13
x₂=1+√13
3) ...18-8x+16-10+4x<0
-4x+24<0 , 4x>-24 , x> -6
4).....3(x-6)-4x-2*12≥0
3x-18-4x-24≥0
-x-42≥0
x≤-42
Verified answer
2. a) 3x^2+13x-10=0
D=169+120=289
x1=(-13-17)/6=-30/6=-5
x2=(-13+17)/6=4/6=2/3
b) 5/(x-3) - 8/x=3
составим систему
sistema x-3 ne raven 0
x ne raven 0
5x-8x+24=3x^2-9x
sistema x ne raven 3
x ne raven 0
3x^2-6x-24=0
x^3-2x-8=0
D=4+32=36
x1=(2-6)/2=-2
x2=(2+6)/2=4
resheniemsistemy budet x {-2,4}
3. a) 18-8(x-2)<10-4x
18-8x+16<10-4x
34-8x<10-4x
-4x<-24
x>6
b) (x-6)/4 - x/3>=2
3x-18-4x>=24
-x>=42
x<=-42