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We have been given an equation of circle . We are asked to find the center and radius of the circle.
First of all, we will write equation of circle is standard form , where center of circle is at point (h,k) and radius is r.
Let us complete the square for both x and y.
Adding half the square of coefficient of x and y term, we will get:
Therefore, the center of the circle is and radius is 4 units.