What is the equation of a circle with a center located at (4, -1) and a radius of 9?

(x-4) ^2 + (y+1)^2 = 81    

Step-by-step explanation:

The equation of a circle is given by

(x-h) ^2 + (y-k)^2 = r^2  where (h,k) is the  center and r is the radius

(x-4) ^2 + (y--1)^2 = 9^2

(x-4) ^2 + (y+1)^2 = 81      

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