Question

Select the correct answer. Which equation represents circle W? A. (x − 6)2 + (y + 4)2 = 4 B. (x − 6)2 + (y + 4)2 = 16 C. (x + 6)2 + (y − 4)2 = 4 D. (x + 6)2 + (y − 4)2 = 16

(the twos on the side are exponents, they're being squared)

Answer 1

B. (x − 6)^2 + (y + 4)^2 = 16

Explanation:

Trust me

Answer 2

You forgot the circle.

But to find it

The equation of a circle is
(x-h)^2+(y-k)^2=r^2

So the h is the x coordinate of the center.
If your x value is positive you write it as a negative and if it’s negative you write it as positive. Same with k that represents the y coordinate of the center. Lastly, the r^2 is just the radius squared.

So if you had a circle with a center at (-2,5) and a radius of 3.

You’d get

(x+2)^2+(y-5)^2=9