Information about what connections the TV has isn't consistent. It may have 3.5mm stereo mini jack for analog audio output. You need a cable with that plug at the TV end and two RCA plugs at the Bose end. Check the TV manual in case you have to turn the audio output on and the TV speakers off in the TV menu.
If it has a digital audio output (coax or optical) you will need a digital to analog converter and cables to connect it.