And when you remember that the graph of a quadratic function is a parabola, this makes a lot of sense. Every parabola has an axis of symmetry that splits the parabola into two mirror-image pieces.

Save guides, add subjects and pick up where you left off with your BBC account. All quadratic functions have the same type of curved graphs with a line of symmetry. The graph of the quadratic ...

Learn about and revise quadratic, cubic, reciprocal and exponential graphs with this BBC Bitesize GCSE Maths Edexcel study guide.