How do i fix a broken spark plug? on 2000 Chevrolet Tracker

When removing changing the spark plugs one was broken. How bad is this? expensive to fix? car has about 140,000 miles.

Asked by for the 2000 Chevrolet Tracker
can you still get a socket on it? if so spray carb cleaner at base of plug and let soak. hope this helps othrwise you might need help from a mech
1 more answer
you can try and heat it up slowly but you have to be careful becaus its an aluminum head Iwould recommend you take it to you local repair shop if they cant get it out you will have to pull the head off