Default (ROOT) Help Please

Hi Developers Of XDA!!

I need your help here, my uncle bought me an LG LS840 4G LTE (VIPER) of SPRINT, It Has Android 4.0.4 ICS(Ice Cream Sandwich)
And I see some videos of how to root it and that cellphone already rooted and i want to root my LG To Play My favorites TOUCH-ONLY Games With My PS3 Controller and with USB/BT Joycenter Aplication

żIs this cellphone ROOTEABLE and can i ROOT it? Please Help Me

And Thanks For All That You Can Do to help me....