4х^2+1.6х-0.09=0 D=1.6^2-4*4*(-0.09)=4
x1=(-1.6+2)/8=0.05
x2=(-1.6-2)/8=-0.45
0.1x^2+0.4x-14=0
D=0.16-4*0.1*(-14)=5,76
x1=(-0.4+2.4)/0.2=10
x2=(-0.4-2.4)/0.2=-14
{x+y^2=5
{3x-y=8
y=(3x-8)
x+(3x-8)^2=5
x+9x^2-48x+64-5=0
9x^2-47x+59=0
D=(-47)^2-4×9×59=2209-2124=85
x1=(-(-47)-V85)/2×9=(47-9,22)/18=2.1
x2=(-(-47)+V85)/2×9=(47+9,22)/18=3.12
y1=3×x1-8
y1=3×2.1-8
y1=6.3-8
y1=-1.7
y2=3×x2-8
y2=3×3.12-8
y2=9.36-8
y2=1.36
(2.1;-1.7); (3.12;1.36)