I purchased a used car mar 2015. I like deal that ...

I purchased a used car mar 2015. I like deal that I got. I was shown a carfax that was clean, no accidents. I purchased the car based on those facts. I went to trade the the car in and found out that the car had a major accident before I purchased it, where the air bag deployed. This drops the price of my car significantly. I really dont like being lied to and sold a bill of goods.