Question

What is the equation of a circle with a center at (-4, -8) and a radius of 1.9?

Answer 1

13.8

Answer 2

That isn't a equation, but ok

Answer 3

oh the equation of the circle is 3.9 in the iquisdent of 402 and 29 to 39

Answer 4

(x - h)2 + (y - k)2 = r2

Answer 5

(h,k) = center points

Answer 6

Oh so I just plug the values in. thanks!

Answer 7

Np :)

Answer 8

u know u wanna click that best response button ;)

Answer 9

Haha okayyyy I will

Answer 10

Thanks, im officially A "life saver"

Answer 11

What is the equation of a circle with a center at (-3, 6) and a radius of 7?
Would this one be (x-3)^2 + (y-6)^2= 7^2?

Answer 12

close, more like (x-(-3))^2 + (y-6)^2 = 7^2

that turns into (x+3)^2 + (y-6)^2 = 49

Answer 13

Thanks!

Answer 14

np

Answer 15

be careful with signs.. they get you alot

Answer 16

SO if the center points are negative, does the minus sign in the equation become positive?

Answer 17

yeah you have a sign flip

Answer 18

yes... a negative * a negative = positive

Answer 19

Got it! Do either of you know the equation formula for parabolas? What is the equation of a parabola with vertex (0, 0) and a focus at (2, 0)

Answer 20

Or how to answer that question

Answer 21

y = ax 2 + bx + c

Answer 22

How would the values in the question go into that equation? For an example cause I have 10 problems like that :(

Answer 23

y= a(x-h)2+k this is for the focus points, like the center of a circle. except its the center of the parabola

Answer 24

Ah you def deserve the life saver badge. Thanks!