(12C Platinum) Zero of Function

[Albert Chan]

Hi, Gamo

I thought Secant's method required 2 points, thus 4 variables: (x0, f0), (x1,f1)
Interpolate the line to (x2, 0):

Slope = (f1-f0)/(x1-x0) = (f1-0)/(x1-x2)

--> x2 = x1 - f1/(f1-f0) * (x1-x0)

The method only use the most recent 2 points.
There should be some updates: x0,f0,x1,f1 = x1,f1,x2,f(x2)

For your code, I did not see f0 anywhere.

Also, your code seems to start the equation at line 023.