Question

help?!?
A circle has its center at (-2, 5) and a radius of 4 units. What is the equation of the circle?

(x + 2)2 + (y - 5)2 = 16

(x + 2)2 + (y + 5)2 = 16

(x + 2)2 + (y - 5)2 = 4

(x - 2)2 + (y + 5)2 = 4

Answer 1

the equation of a circle: (x - h)^2 + (y - k)^2 = r^2
(h, k) = center and r = radius
so for when its center is at (-2, 5) and it has a radius of 4
plug in h=-2 , k=5 , and r=4 into the circle equation

Answer 2

the answer will be D

Answer 3

I don't think the answer would be D...
because of the r^2 part 4^2 = 16

Answer 4

No. not d. Look at Jiggly's formla.....h is -2....so you get (x - (-2))^2 in the formula.
also k is 5 ... so you get (y - 5)^2 in the formula

Answer 5

will it be A

Answer 6

yes :)

Answer 7

thx

Answer 8

you're welcome :)