How to draw a graph of a function from a picture of Kopatych?

Question

Graphic arts

I need to draw a graph of a function from a picture

Kopatych

,
according to

this

formula.

You can draw on the online graphic calculator .

Answer 1

But this is the usual, just a modified formula of the quadratic equation)
"a" with an increase makes the parabola more "narrow", growing faster. "h" does the opposite. "k" raises/lowers the inflection point of the parabola.