Graphing
To graph the parabola , apply the standard graphing procedure:
First, determine the direction of the opening. Since is positive, the parabola opens upward. Next, find the axis of symmetry: . Then, find the vertex by substituting : . The vertex is . Find the -intercept by setting , yielding , so the -intercept is . A point symmetric to it across the axis of symmetry is . Find the -intercepts by setting : , which factors to , giving and . The -intercepts are and . Finally, plot the vertex, intercepts, and the symmetric point, and connect them with a smooth curve to sketch the parabola.
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Ch.10 Quadratic Equations - Elementary Algebra @ OpenStax
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