2x²>8x+3
2x²-8x-3>0
Delta=64+4•3•2=88 sqrt88=2√22
x₁=(8-2√22)/4=(4-√22)/2 ∨ x₂=(4+√22)/2
ramiona skierowane do gory wiec
x∈(-∞,(4-√22)/2) suma ((4+√22)/2,∞)
2x³-18x=0
2x(x²-9)=0
2x(x-3)(x+3)=0
x=0 ∨x=3 ∨ x=-3
x²+y²-2x+4y-5=0
(x-1)²+(y+2)²=5+1+4=9==> r=3 o srodku S=(1,-2)
do prostej
y=ax+b ∋ O=(0.0)
0=0+b==>b=0
y=ax+b ∋ S=(1.-2)
-2=a•1+0
a=-2
y=-2x
