Help

$(x-a)^2 + (y-b)^2 = r^2 \text{(equation of circle )}$

where your:

a=-2      (x-a)^2=(x+2)^2

b=4        (y-b)^2=(y-4)^2

r=4         r^2=16

Here s your graph:

https://www.desmos.com/calculator/ivygaohoig

play with desmos and you will understand

Nice answer Solveit!

CPhill has nominated your answer here for the wrap.

That is a BIG compliment.        

Congratulations :)