Report an error

If a solver, worked example, or explanation looks wrong, please tell us. You do not need an account, and there is no form to fill in — just send an email with a few details so we can reproduce the problem.

What to include

• The URL of the page where you saw the problem
• The name of the solver or exercise
• The input values you used
• The result you got
• The result you expected
• Any step that looks wrong
• Optionally, your browser and device (for example, Chrome on Android)

Send it

Email the details to support@calxsolver.com. The button below opens your email app with the subject already filled in.