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3=2*(-1)^2+b*(-1)-2c
1=8+2b+2c
3=2-b-2c
2b+2c=-7
b=-2c-1
2(-2c-1)+2c=-7
-4c-2+2c=-7
-2c=-5 /:-2
c=5/2
b=-2*5/2-1=-5-1=-6
y=2x^2-6x+2*5/2=2x^2-6x+5
odp.
b=-6
c=5/2