2х^2+х+67=0
Д=1-4×2×67=-635=//нет ответа
4х+х^2=0
х (4+х)=0
х=0
4+х=0
х=-4
(0;-4)
3х^2-27=0
3х^2=27
х^2=27/3
х^2=9
х=3
5х^2-3х-2=0
Д=9-4×5×(-2)=9+40=49 +-7
х1=(3-7)/2×5=-0.4
х2=(3+7)/2×5=1
(-0.4; 1)
b^2-3=0
b^2=3
b= √3
х^2+6х+5=0
Д=36-4×1×5=16. +-4
х1=(-6-4)/2×1=-5
х2=(-6+4)/2=-1
(-5;-1)
х^2+6х+8=0
Д=36-4×1×8=4. +-2
х1=(-6-2)/2=-4
х2=(-6+2)/2=-2
(-4;-2)
9-6х+х^2=0
х^2-6х+9=0
Д=36-4×1×9=0
х=6/2=3
ответ; 3
12b^2+2b-2=0
D=4-4×12×(-2)=4+96=100 +-10
b1=(-2-10)/(2×12)=-12/24=-1/2
b2=(-2+10)/24=8/24=1/3
(-1/2; 1/3)
3y^2+4y-4=0
D=16-4×3×(-4)=64. +-8
y1=(-4-8)/(2×3)=-2
y2=(-4+8)/6=2/3
(-2; 2/3)
6x^2+3x+4=0
D=9-4×6×4=-87=/нет ответа
7у^2-14у=0
7у(у-2)=0
у-2=0
у=2
7у=0
у=0
(2; 0)
25-у^2=0
-у^2=-25
у^2=25
у=5
17х^2+16х-33=0
Д=256-4×17×(-33)=2500. +-50
х1=(-16-50)/(2×17)= -66/34=-33/17
х2=(-16+50)/34=1
(-33/17; 1)
7х^2+4=0
7х^2=-4
х^2=//-4/7 нет ответа!!
4х^2+5х+1=0
Д=25-4×4×1=9. +-3
х1=(-5-3)(2×4)=-1
х2=(-5+3)/8=-1/4
(-1;-1/4)
х^2+2х-3=0
Д=4-4×1×(-3)=16. +-4
х1=(-2-4)/2=-3
х2=(-2+4)/2=1
(-3; 1)
25х^2+20х+4=0
Д=400-4×25×4=0
х=-20/50=-0.4
(-0.4)
9х^2-39х+12=0
Д= 1521-4×9×12=1089. +-33
х1=(39-33)/(2×9)=6/18=1/3
х2=(39+33)/18=4
(1/3; 4)
12х^2-16х-3=0
Д=256-4×12×(-3)=400. +-20
х1=(16-20)/(2×12)=-4/24=-1/6
х2=(16+20)/24=3/2
(-1/6:3/2)