The Python code and graph below model the quadratic function y = x2 + k.

This Python code is written as a Jupyter Notebook. To learn more about Jupyter Notebook, please visit jupyter.org . The Jupyter Notebook is a powerful web application used by computational scientists,  which allows you to create and share documents that contain live code, equations, visualizations and narrative text.

Install Jupyter Notebook on your computer. Enter and run the code.

What is the role of k in the graph of the function?