So there is a new root tool (its in another language but the main button is practically English,) and it has been confirmed(by me I tested it) to work on 740g. Its called Key Root Master.
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!
CLICK THE RIGHT BUTTON ON SUPER SU- LIKE NOTIFICATION SCREEN TO ACCEPT ROOT PERMS
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