Question 739442
<pre>
I can understand homeschooling in the early grades, because most
parents know the basic 3 R's, but when the kids have to learn 
stuff the parents cannot help them with, then it's time to go 
to public or private school. That's my personal philosophy and
does not necessarily represent the philosophy of anybody else
on this site.

Anyway:

You have to memorize the standard equation for a circle.
It is

(x - h)² + (y - k)² = r²

where 

"h" is the x-coordinate of the center.  In your case that's -2.
So we substitute -2 for h.

"k" is the y-coordinate of the center.  In your case that's -3.
So we substitute -3 for k.

"r" is the length of the radius.  In your case that's 8.
So we substitute 8 for r.

(x - h)² + (y - k)² = r²

(x - (-2))² + (y - (-3))² = (8)²

(x + 2)² + (y + 3)² = 64

We don't substitute anything for x and y.  We leave them
variable:

Edwin </pre>