Here is the graph
https://www.desmos.com/calculator/7r6zlevfrv
Using the graph can you see what the answer is?
You also need to be able to work these out without graphing first (it is good to graph afterwards for checking you answer)
X^2 is always going to be positive.
x can't be 1
Do you know how to use calculus Tom?
If so it is easy just to differentiate and then set y'=0 to find the stationary points etc.
California is on the San Andreas Faultline.
There will always be a lot of Earthquakes in this region because two techtonic plates as slowly sliding past each other here.
Here is a video explaining plate techtonics.
The voice is childish but the information is good.
https://www.youtube.com/watch?v=OinfMLdornU
And here some info on the San Andreas fault.