The first 5 outputs are:

As you can see, the outputs keep doubling each time we increment x by 1.
This can be written formally, observing that if you know the value of
, the next value will be

So, again, we've shown that the next value is twice the previous one, so you have

Exact value of that equation is 4
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Step-by-step explanation:
General equation of the circle with center (h,k) and radius r,
(x-h)²+(y-k)²=r²
Therefore, on comparison
center ( 4, -2)
radius r= 4√2