3х² +5х-2=0
D=5²+4*3*2=49 (±7²)
x1=(-5-7)/6= - 2
x2=(-5+7)/6=1/3
9-6x+x²=0
x² -6x+9=0
D/4=3²-9=0
x=3
3x² -24x+45=0
x² -8x+15=0
D/4=4² -15=1
x1=4-1=3
x2=4+1=5
2a²+3a+1=0
D=3²-4*2=1
a1=(-3-1)/4= - 1
x2=(-3+1)/4= -1/2
6-2x²=0
2x²=6
x²=3
x=±√3
2x²-5x+3=0
D=5²-4*2*3=1
x1=(5-1)/4=1
x2=(5+1)/4=1.5
25-100x²=0
100x² -25=0
4x² -1=0
x²=1:4
x²=0.25
x=±0.5
3x-x²=0
x²-3x=0
x(x-3)=0
x1=0
x-3=0
x2=3
12+3x²+2x=0
3x²+2x+12=0
D/4=1² -3*12= - 35 - нет решений
5x²-26x+5=0
D/4=13²-5*5=144 (±12²)
x1=(13-12)/5=0.2
x2=(13+12)/5=5