I'm pretty sure it'd just be a parabola with is axis at 0 facing upwards and the inverse would be facing downwards
Probably they never forget to give the Miranda warning.
The +k part of the function takes the original function and translates it straight up k units. It's as simple as that. If your function is the line f(x) = 3x, then the function f(x) = 3x + 4 moves that first function up 4 units.
