Question

Which equation is this circle??

Answer 1

well the (h, k) is the centre and r is the radius.

So the standard form is

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

looking at the graph r= 3.... so you need r^2 = 9

just identify the centre...

Answer 2

Great thank you!!

Answer 3

I've got the answer D?

Answer 4

Or -h would make the 3 positive, so I'm thinking C...?

Answer 5

well the centre looks like (-3, 2)

so substituting you get

(x - - 3)^2 + (y - 2)^2 = 3^2

which is

(x + 3)^2 +(y - 2)^2 = 9

so I think C is the better choice