The equation (x + 9)^2 + (y - 4)^2 = 81 models the position and range of the source of a radio signal. Describe the position of the source and range of the signals.
1 answer
The center of the circle is (-9,4) and the radius is 9. Therefore, the source of the radio signal is located at (-9,4) and the range of the signal extends up to a distance of 9 units in all directions from the source.