Complete the square and write the equation in standard form. Then give the center and radius of the circle and graph the equation.x2 + y2 + 6x + 8y + 21 = 0
A. (x - 3)2 + (y + 4)2 = 4
center (3, -4), r = 2
B. (x + 3)2 + (y - 4)2 = 4
center (-3, 4), r = 2
C. (x + 3)2 + (y + 4)2 = 4
center (-3, -4), r = 2
D. (x - 3)2 + (y - 4)2 = 4
center (3, 4), r = 2
Answer: C
Mathematics
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