The definition of a quadratic spline is that;
A Quadratic Spline is the creation of a set of polynomial functions that are quadratic and follow the format f(x) = ax² + bx + c.
A Quadratic Spline is simply defined as the creation of a set of polynomial functions that are quadratic, or relatively simple to comprehend and must follow the quadratic function format which is;
f(x) = ax² + bx + c
where;
a, b and c are the values gotten in the process of doing the Splines to create the desired functions.
Read more about quadratic functions at; https://brainly.com/question/1214333