y=ax2+bx+c, how can you tell which choice can be eliminated right away by looking at the equation without actually plotting any of the points?

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Esther -This is the general equation for a parabola.If a is positive, the parabola opens upward. Otherwise, it opens downward.The vertex has an x-coordinate equal to -b/2a. You can find the y-coordinate by plugging the x-coordinate back into the original equation and solving for y.The x-intercepts (if they exist) or zeros can be found by setting the equation equal to zero and solving for x by any of the following methods:1. factoring2. completing the square3. quadratic formulaHope that helps