I quote here an answer from the official Apple website:
"Does the Apple Pencil work on the IPad 9.7 2017?"
"No, use only works on the Pro series IPads, as well as the 2018 IPad."

https://www.apple.com/ch-de...

As it stands, the Apple Pencil does not work with the "normal" 2017 IPads. If you have an IPad Pro it should basically work.

Hope I could help you!