Question

guys plz help find the coordinates of centre and radius of following circle
x2-6x-4y2-16y-11=0

Answer 1

general form of equation is $x^{2}+2gx+2fy+y^{2}+c=0$
Here the coordinates of center are (g, f) and radius is $\sqrt {g^{2}+f^{2}-c}$
But the equation you have given is $x^{2 } -4y^{2}-16y-11-6x=0$not of a circle, as the coefficients of x^2 and y^2 terms is not equal. So there will be no center nor radius.