Решите уравнения

1) 6x^2+x-1=0

2) 2x^2-5x+3=0

3) 3x^2+7x-6=0

4) 2x^2-9x+4=0

5) 2x^2+3x-2=0

1) 6x^2+x-1=0

D=1+24=25

x1 = (-1-5) / 12=-1/2

x2 = (-1+5) / 12=1/3

2) 2x^2-5x+3=0

D=25-24=1

x1 = (5-1) / 4=1

x2 = (5+1) / 4=1,5

3) 3x^2+7x-6=0

D=49+72=121

x1 = (-7-11) / 6=-3

x2 = (-7+11) / 6=2/3

4) 2x^2-9x+4=0

D=81-32=49

x1 = (9-7) / 4=1/2

x2 = (9+7) / 4=4

5) 2x^2+3x-2=0

D=9+16=25

x1 = (-3-5) / 4=-2

x2 = (-3+5) / 4=1/2