Question 623308
The standard equation for a circle is (x-h)² +(y-k)²=r²; where the center of the circle lies on (h, k) and the radius of the circle measures r.
If the center is at (0, -4) and the radius is 7, then the equation would be:

(x-0)² + (y+4)² = 7²
x² + y² + 8y + 16 - 49 = 0

Ans: 
x² + y² + 8y - 33 = 0

:D