HT201398: If an app you installed unexpectedly quits, stops responding, or won’t open
Learn about If an app you installed unexpectedly quits, stops responding, or won’t open
Q: Ibook opens and shuts straight down on my iPad
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Feb 7, 2015 3:53 AMby King_Penguin,With iOS 8 the iBooks app is now built-in to iOS, you won't be able to delete and redownload it.
You've tried what's on the page that you posted from i.e. closing the app via the iPad's taskbar and seeing if it works when you re-open the app : Force an app to close in iOS - Apple Support
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Feb 7, 2015 10:46 AMby King_Penguin,You could also try deleting all books from the apply connecting it to your computer's iTunes - either change your sync options or use the Books tab under the 'on my device'' heading to select and remove them. If you haven't already got copies of all the books on your computer's iTunes then first do File > Devices > Transfer Purchases to copy them over (you might be able to redownload ibook purchases, but any item could be removed from the store at any time), and if using a Mac with Mavericks or Yosemite on it then do File > Move Books From iTunes in its iBooks app.
If the app then opens with no books in it then try syncing them back
