What is the center and radius of the circle represented by the equation (x – 9)2 + (y + 2)2 = 4?

Question

A.center: (–9, 2), radius: 4

B. center: (–9, 2), radius: 16

C. center: (9, –2), radius: 4

D. center: (9, –2), radius: 2

Answer 1

D

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

In this case, h=9, k=-2, radius = 2.