How to plot parabola?

how can I plot a parabola?

Answer 1

[David Hill]

p=polyfit([0 -3 .5],[2 -1 .75],2);
x=-10:.01:10;%whatever you want for x
plot(x,polyval(p,x));

[David Hill]

p contains [a,b,c]

[Image Analyst]

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[David Hill]

If you a satisfied with the answer, you should accept it to close out the question.