An equation for a parabola always has some type of irregular variable, usually a squared variable or higher.
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A parabola equation cannot be answered since it is not a question!
The answer depends on the form in which the equation of the parabola is given. For y^2 = 4ax the directrix is x = -2a.
The equation does not represent that of a parabola.
The graph of a quadratic equation is a parabola
A parabola looks like a frowning face :( or a smiling face :) The type of equation that would give you a parabola is called a Quadratic equation. Quadratic equations have x^2 as the highest exponent in the equation. ex: x squared + 2x + 1