Question

Which is an equation of the circle with a radius of 9 units and center at
(–4, 2)?

A. (x − 9)2 + (y + 4)2 = 4
B. (x − 4)2 + (y + 2)2 = 81
C. (x + 4)2 + (y − 2)2 = 81
D. (x − 2)2 + (y + 4)2 = 81

Answer 1

circle eqn:

\[(x - h)^2 + (y - k)^2 = r^2\]

where the center is the point (h, k) and the radius is r.

which do you think based on this?

Answer 2

B

Answer 3

try again :). notice that its x minus h and y minus k . -(-) = +

Answer 4

I am sure that is not A and not B as you said

Answer 5

C?

Answer 6

RIGHT?

Answer 7

yes. sorry for delay