y=x^2+x+1

y=2*x^2+x+1

y=3*x^2+x+1

y=-x^2+x+1

y=-(2*x^2)+x+1

y=-(3*x^2)+x+1

y=1/2*x^2+x+1

y=-(1/2*x^2)+x+1

Graph of the formula

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