Respuesta :

akephd
X^2+ (y+8)^2 = 81.....this is C.
X^2 + y^2 + 16y +64=81 so x^2 + y^2 + 16y = 17.....this is D.

So I’d say C and D are correct

Answer:

C and D

Step-by-step explanation:

The equation of a circle is

(x - h)² + (y - k)² = r²      where (h,k) is the center, and r is the radius

Plug in what you were given, and simplify...

(x - 0)² + (y - (-8))² = 9²

  x² + (y + 8)² = 81

This is answer C.

We can get answer D by foiling out (y + 8)² and simpligying...

 x² + y² + 16y + 64 = 81

    x² + y² + 16y = 17    (subtract 64 from both sides)

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