The equation of a circle with center x=h and y=k and radius r, is:
(x - h)^2 + (y - k)^2 = r^2. Here I am using the symbol ^ to indicate exponentiation.
In your example, h=-2, k=1, r=2.
(x - -2)^2 + (y - 1)^2 = 2^2, or
(x + 4)^2 + (y - 1)^2 = 4.
You need to draw a graph of a circle with center (-2,1) and radius 2.
|