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What are the center and radius of the circle defined by the equation ? A. Center (3, -4); radius 2 B. Center (-3, 4); radius 2 C. Center (-3, 4); radius 4 D. Center (3, -4); rad…

What are the center and radius of the circle defined by the equation ? A. Center (3, -4); radius 2 B. Center (-3, 4); radius 2 C. Center (-3, 4); radius 4 D. Center (3, -4); rad…
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What are the center and radius of the circle defined by the equation ?

A. Center (3, -4); radius 2
B. Center (-3, 4); radius 2
C. Center (-3, 4); radius 4
D. Center (3, -4); radius 4

What are the center and radius of the circle defined by the equation ? A. Center (3, -4); radius-example-1
User Stefano Ortisi
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2 Answers

6 votes
it might be B im not sure

User Psadac
by
9.0k points
5 votes
x^2 - 6x + y^2 + 8y + 21 = 0
(x - 3)^2 - 9 + (y + 4)^2 - 16 = -21

(x - 3)^2 + (y + 4)^2 = -21 + 9 + 16 = 4

so center is at (3,-4) and radius = sqrt4 = 2

Answer is A

User Cameron
by
8.2k points
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