If you have not done so already, follow these simple instructions to install Rust, Node.js, SSVM, and ssvmup.
$ ssvmup build
$ cd node
$ node test.js
7.0
$ cd node
$ node server.js
Listening at http://localhost:8080
Then point your browser to http://hostname:8080
enter numeric values for a
, b
and hit the "Solve" button to find the roots.