1.Download Apk and install it.
2.Open the app and click the third button(it should say a few things, and then install something]
3.When it finishes, exit out of app
4. Check for root app(open root app again and check if a notification like super user appears
5. Congrats on root!
I wish you all good luck!
Disclaimer: it may not work on other tabs(didn't make the app)
Sent from my LG-E739 using xda app-developers app