What is the equation of a circle with a center located at (4, -1) and a radius of 9? A. (x+4)2 + (y - 1)2 = 9 B. (x + 4)2 + (y – 1)2 = 81 C. (x – 4)² + (y + 1)2 = 9 D. (x – 4)² + (y + 1)2 = 81​

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.