How to use CNN to get the parameters of the quadratic equation with one unknown?

Dear,
There is a question of the [script](https://github.com/MorvanZhou/Tensorflow-Tutorial/blob/master/tutorial-contents/301_simple_regression.py),
Could it be a little hard,if the function is y=a*x^2 +b*x +c ?
Any idea to change the code?
Thx