Been a longtime
void GetSlopeAroundPointX(int x)
{
double x2 = x + 0.1, x1 = x - 0.1;
double y2 = Math.Pow(2.0, x2), y1 = Math.Pow(2.0, x1);
double dx = x2 - x1;
double dy = y2 - y1;
double slope = dy / dx;
System.Console.WriteLine($"{dy:0.#}({y2:0.#} - {y1:0.#})/{dx:0.#}({x2:0.#}-{x1:0.#}) = {slope:0.#}");
}
GetSlopeAroundPointX(7);
17.8(137.2 - 119.4)/0.2(7.1-6.9) = 88.8