x0=2=-b/2a=-b/(-4)=b/4=2; b=8
y0=1=y(x0)=y(2)=-2*4+8*2+c
c-8+16=1
c=-7
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x0=2=-b/2a=-b/(-4)=b/4=2; b=8
y0=1=y(x0)=y(2)=-2*4+8*2+c
c-8+16=1
c=-7