It is tough and persistent and difficult to get rid of if you want to plant another type of lawn grass. Bermuda puts down long, tough roots that will survive wildfires that singe top growth to ashes, and will tap water far deeper than other sod grasses. It spreads by underground stolons as well as aboveground runners. But it goes dormant at the first hint or frost or drought. The entire lawn goes brown and dry and doesn't green up again till serious rains begin.
Many snowbirds think it has died.
Keep it green by watering if you have the water and it is legal and weather is warm enough. In any event, it's best to till up the soil, incorporating as much compost and other organic matter as you can. Keep watered and be patient You can establish full cover from seed in one season. Get down deep and pull out as much root as possible. Water and keep consistently moist.