1) 2Xв2 - 5X+3

2) 5Xв2-X-42

3) 36Xв2-12X+1

4) Xв2+9X-22

5) 4Xв2-11X+7

6) 2Xв2-7X+5

1) 2x^2-5x+3=0

D = (-5) ^2-4*2*3

D=25-24=1

x=-b/2a

x=5/4=1.25

2) 5x^2-x-42=0

D = (-1) ^2-4*5 * (-42) = 1+840=841

X1=1+29/10=3

X2=1-29/10=-28/10=-2.8

3) 36x^2-12x+1=0

D = (-12) ^2-4*36*1=144-144=0

4) x^2+9x-22=0

D=9^2-4 * (-22) = 81+88=169

x1=-9+13/2=1

x2=-9-13/2=-11