In these tutorials I show you how we can use completing the square to sketch a quadratic graph, locate the maximum or minimum points and the equation of the line of symmetry.

Part 1: (+ax2 types)

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Sketching Quadratic Graphs by Completing the Square (Part 1) : ExamSolutions Maths Revision

Part 2: (-ax2 types)

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Sketching Quadratic Graphs by Completing the Square (Part 2) : ExamSolutions Maths Revision

Experiment with the Graph

Move the sliders in the graph below

  1. See how p stretches the graph. See what happens for positive and negative values.
  2. See how q translates the graph parallel to the x-axis.
  3. See how r translates the graph parallel to the y-axis.