maximization of a quadratic equation

suggest me a quadratic equation which i can maximize and please show its correct answer or graph or show me a two-diamensional graph having a peak point in it and tell me its equation

[Walter Roberson]

This does not appear to be a MATLAB question.

Answer 1

[Voss]

Here you go: https://courses.lumenlearning.com/ivytech-collegealgebra/chapter/determine-a-quadratic-functions-minimum-or-maximum-value/