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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 2 B Center 3 4 radius 2 C Center 3 4 radius 4 D Center 3 4 radius 4 class=

Respuesta :

it might be B im not sure
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

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