Regula falsi - Wikipedia
https://en.wikipedia.org/wiki/Regula_falsiIn mathematics, the regula falsi, method of false position, or false position method is a very old method for solving an equation with one unknown; this method, in modified form, is still in use. In simple terms, the method is the trial and error technique of using test ("false") values for the variable and then adjusting the test value according to the outcome. This is sometimes also referred to as "guess and check". Versions of the method predate the advent of algebraand the u…
The Method of False Position
web.mit.edu › 10 › WebOne such method is the Method of False Position. Here, we start with an initial interval [ x 1 , x 2 ], and we assume that the function changes sign only once in this interval. Now we find an x 3 in this interval, which is given by the intersection of the x axis and the straight line passing through ( x 1 , f ( x 1 )) and ( x 2 , f ( x 2 )).