The 1st one would be the answer.
The reason I chose the 1st one instead of the 2nd one is b/c if you see the Domain, it goes all across on both sides and covers each value. As for the range, it doesn't.
This is a hyperbola that intercepts the y axis
Here's the graph, NSS
The center is (0,0)
Putting this into standard form by dividing both sides by 84 we have
___ - _____ = 1
The domain is all real numbers because the graph extends to infinity in both directions along the x axis
The range is y ≤ - √7 and y ≥ √7
The first answer is correct