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All Posts Tagged Tag: ‘parabola’

How Do I Know Which Direction the Parabola Opens?

From the Value of a There are a couple of ways we can determine the direction the parabola opens. The a-value is one way. If a > 0, then the parabola opens upward. If a < 0, then the parabola opens downward. Recall that when the parabola is given in standard form, y = ax¬≤ + bx + c, the …

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Finding the Vertex, Focus, and Directrix of a Parabola Given in Standard Form

Prob20130529

Watch two things in these types of problems. First, the geometry of the situation — i.e. the orientation of the parabola and its various parts; and second, make sure your formulas are properly applied, as there are many k’s, p’s and a’s floating around and are a lot to contend with. SEE ALSO: How to find the directrix of a …

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