Given the equation x^2+8x+y-2y-8=0 Which of these represents the center and radius of the circle?   Question 20 options:   a)  center: (4,-1), radius: 5   b)  center: (4, -1), radius: 42   c)  center: (-4, 1), radius: 25   d)  center: (-4, 1), radius: 5

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