Numerical root finder

How to use this calculator

Edit FindRoot(residual,[(variable,start)]). The example finds the fixed point of cosine near 1.

Tap the math below to edit it and see the result. Once a result is ready, press Tab on a hardware keyboard to accept it. Outside a matrix, Return completes the line; the phone math keyboard has the same Return action.

Try it here

Interactive tools require JavaScript. You can read the guide and example without it.

What to know

Inspect the convergence and residual rows, not only the parameter value. A local search does not find every root, and a nonconverged result is not a successful solution.

Mathlean combines visual mathematical input with computation and canvas tools. Results depend on the expression and available engine support; check important answers independently.