The circle below is centered at the point (5 3 ) and has a radius of length 4 what is its equation

The equation of the circle is may be expressed as, 
                           (x - h)² + (y - k)² = r²
where h and k are the abscissa and ordinates of its center, respectively, and r is radius. Substituting the given values to the equation above, 
                          (x - 5)² + (y - 3)² = 4²
Simplifying further the equation gives, 
                            x² + y² - 10x - 6y + 18

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