Online calculator: Fixed-point iteration method
https://planetcalc.com/2824This is exactly what the calculator below does. It makes iterative calculations of x by a given formula and stops when two successive values differ less than a given precision. It is also worth mentioning that a function used as an example, i.e., is the iterated function for calculating the square root of a.
Equation calculator (linear, quadratic, cubic, linear ...
https://www.hackmath.net/en/calculator/solving-system-of-linear-equationsWrite each equation on a new line or separate it by a semicolon. The online calculator solves a system of linear equations (with 1,2,...,n unknowns), quadratic equation with one unknown variable, cubic equation with one unknown variable, and finally, any other equation with one variable. Even if an exact solution does not exist, it calculates a numerical approximation of roots.