Question

Circle A has an equation of x2 + (y + 3)2 = 16. Where is the center of the circle located?

Answer 1

what do you think is the center of this one?

Answer 2

I would say, the X axis?

Answer 3

(x )^2 + (y+3)^2 = 16
(x - h)^2 + (y+3)^2 = 16

Answer 4

what is h in this case?

Answer 5

x - ??? = x

Answer 6

16?

Answer 7

x - 16 = x ???
that don't seem right does it?

x - ??? = x
for example,
7 - ??? = 7

Answer 8

hmm.. im not sure.

Answer 9

try this one: 10 - ? = 10
what do i subtract from 10 to get 10?

Answer 10

still having a hard time?

Answer 11

yea, sorry, I do not know why i don't know that :/

Answer 12

it's ok... this is one part a lot of people mess up with too..

Answer 13

say you have 20 dollars and you left it on the table...
you think someone took away some money from the table and after you're count the amount of money on the table there is still 20 dollars. how much money was taken away?

Answer 14

oh wow im so dumb(dim). haha. So it is 0?

Answer 15

yes... and you're not dumb

Answer 16

haha ty, i'm just joking. I was assessing the problem thinking it was something much more complicated when it was actually something simple as 0.

Answer 17

yw... let's be clear though... what's the center of the circle?

Answer 18

Would it be located in the 3rd quadrant? If not then i still don't get it :/

Answer 19

y+3=0 -> y=-3
So the center is (0,-3) which is located right here.

Answer 20

yes ^^^, remember h=0 so your (h,k) is (0,-3)

Answer 21

so what does y equal?