How to find the parabola?

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If you are trying to know how to find a parabola on the Cartesian coordinate system, then it is basically a symmetrical curve, one midpoint, can be placed anywhere.If you are to know how to find a parabola by equation form, then it usually takes form in y = ax^2+bx+cOtherwise, I don't understand what your question is... sorry. 

the equation is ax squared+bx+c, so c is a constant and a tell direction of parabola