calculus
posted by Quarie .
Find the center (h,k) and radius r of the circle with the given equation.
4(x+4)^2 + 4(y6)^2 = 324

Your equation can be rewritten
(x+4)^2 + (y6)^2 = 81
This is the equation of a circle with radius sqrt(81) = 9, and center at (4, 6)