Answer:
(x+1)^2+(y+4)^2=9
Step-by-step explanation:
First equation in what I like to call center-radius form is (x-h)^2+(y-k)^2=r^2 where (h,k) is center and r is radius.
So we are given (h,k)=(-1,-4) so we have so far that
(x+1)^2+(y+4)^2=r^2
Passes through the point (-1,-1) means at some point (x,y) takes on the point (-1,-1) so guess what we are going to find r^2 by plugging in that point where x and y are.
(-1+1)^2+(-1+4)^2=r^2
(0)^2+(3)^2=r^2
9=r^2
so the equation of the circle is (x+1)^2+(y+4)^2=9
Answer:
(x + 1)² + (y + 4)² = 9
Step-by-step explanation:
The equation of a circle is:
(x - h)² + (y - k)² = r²
where (h, k) is the center and r is the radius.
The center is (h, k) = (-1, -4). The radius is the distance from the center to any point on the circle. (-1, -1) is 3 units above the center, so r = 3.
(x + 1)² + (y + 4)² = 9
