Question

Find the center and radius of the circle with equation (x + 2)squared + (y + 7)squared = 81

Answer 1

To find the center you take the opposite of whatever is in the parenthesis. So, Opposite of 2 and 7 = -2 and -7. To find the radius, simply take the square root of the diameter.
So, Center = (-2,-7) And Radius = 9

Answer 2

Thank You!