Acircle is defined by the equation given below.

x^2 + y^2 - x - 2y - 11/4 = 0

what are the coordinates for the center of the circle and the length of the radius?

a. (1/2, 1), 4 units
b. (-1/2,-1), 4 units
c. (-1/2,-1), 2 units
d. (1/2, 1), 2 units

Hello
x² + y² - x - 2y - 11/4 = 0 
(x²-x) +(y²-2y)-11/4 = 0
(x-0.5x)²-(1/2)² + (y-1)² -1² -11/4=0
(x-0.5)² +(y-1)² = (1/4)+1+(11/4)
                        =  (1/4)+(4/4)+(11/4)
(x-0.5)² +(y-1)² =4²
Answer D the center of the circle is : A (1/2, 1),the length of the radius 2 units