Find iD1, iD3 and Vo for Vi=3V & Vi=-3V. (Diodes)
Yup, you are correct.

You should also learn how to use a simulator. The one built in here is good enough to check your work in simple problems like this. Note I used simple switches for the diodes.







simulate this circuit &ndash; Schematic created using CircuitLab







simulate this circuit

Don't cheat though. It's only for verification.