5x2-14x+8=0
3x2-10x+7=0
9x2-12x+4=0
-4x2-12x+7=0
D=b2- 4ac
1) D=196-4*5*8=196-160=36=62
x1= -b+D/2a=14+6/2*5=2
x2=-b-D/2a=14-6/2*5=0.8
D=100-4*3*7=100-84=16=42
x1= -b+D/2a=10+4/2*3=7/3
x2=-b-D/2a=10-4/2*3=1
3. 9х2-12х+4=0
Д= 144-4*9*4=0
4. -4х2-12х+7=0
Д= 144-4*(-4)*7=256
х1=12+16/ -8=-28/8=-7/2=-3,5
х2=12-16/-8=- 4/-8=0,5
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