Mathlean · Online math workspace
Modular root calculator
Find supported roots of a congruence using modular powers.
How to use this calculator
Edit PowerModList(4,1/2,7); this asks for square roots of 4 modulo 7.
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
A congruence can have several roots or none. This is not a principal real square root.
Mathlean combines visual mathematical input with computation and canvas tools. Results depend on the expression and available engine support; check important answers independently.