how do i reset my ipad to factory defaults

Check this link...

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

first do a back up, then go to settings -> General -> scroll down -> reset -> 2 options

1) reset all settings: this will reset all settings to factory.

2) erase all content and settings: this will erase all the information from your ipad for example apps, photos, videos etc.... plus it will reset all settings.

hope it was helpfull.