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Find the Center (H, K) and Radius R of the Circle

Question 226

Multiple Choice

Find the center (h, k) and radius r of the circle with the given equation.
- x24x+4+y2+16y+64=9x ^ { 2 } - 4 x + 4 + y ^ { 2 } + 16 y + 64 = 9


A) (h,k) =(8,2) ;r=3( \mathrm { h } , \mathrm { k } ) = ( - 8,2 ) ; \mathrm { r } = 3
B) (h,k) =(2,8) ;r=3( \mathrm { h } , \mathrm { k } ) = ( 2 , - 8 ) ; \mathrm { r } = 3
C) (h,k) =(8,2) ;r=9( h , k ) = ( 8 , - 2 ) ; r = 9
D) (h,k) =(2,8) ;r=9( \mathrm { h } , \mathrm { k } ) = ( - 2,8 ) ; \mathrm { r } = 9

Correct Answer:

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