If I call the function with quoted column names, I get a graph — but not the graph I want. Sharon Machlis, IDG This is not the graph I want when trying to create a custom ggplot2 function.

Revise how to recognise and determine the equation of a quadratic function from its graph. BBC Bitesize Scotland revision for SQA National 5 Maths.

Worked examples The graph below has a turning point (3, -2). Write down the nature of the turning point and the equation of the axis of symmetry.