Answer:
(x + 3)² + y² = 16
Explanation:
The equation of a circle in standard form is
(x - h)² + (y - k)² = r²
where (h, k) are the coordinates of the centre and r is the radius
Here (h, k) = (- 3, 0 ) and r = 4, thus
(x - (- 3))² + (y - 0)² = 4², that is
(x + 3)² + y² = 16