Answer:
Cygnus X-1 is not an example of a supermassive black hole because its estimated mass is 14.8 solar masses, which is much smaller than the typical mass of a supermassive black hole, which can range from hundreds of thousands to billions of solar masses.
Step-by-step explanation:
Supermassive black holes are found at the centers of most galaxies, and their mass is thought to be correlated with the mass of the galaxy itself. Cygnus X-1 is a stellar-mass black hole, which forms from the collapse of a massive star and is typically much smaller than a supermassive black hole.