Question

in (x-h)^2+(y-k)^2=r^2 and if the center is (3,-5), does k becomes positive? Or does it stay negative?

Answer 1

Yes, the equation has the center point subtracted from the variable.  In this case the coordinate is negative so it is like adding the coordinate to the variable because --=+

(y--5)^2=(y+5)^2