Use the concept of Lagrange multipliers.
For any circle with Cartesian equation

,
we have that the centre of the circle is

, and the radius of the circle is

.
So in the case that

,
we essentially have that

.
So the centre of the circle is

, and the radius is

.
Answer:
cant read
Step-by-step explanation:
:P
-4+1= -3 -3•-6=18 first you add what's in the parentheses then multiply by the outside.