Question

x^2+y^2+3x-4y+4=0 How can I get the radius?

Answer 1

rewrite as
\[(x-h)^2+(y-k)^2=r^2\] by completing the square, and then you will have the radius

Answer 2

I don't know how to?

Answer 3

alternative :
if given the equation of circle : x^2+y^2+Ax+By+C=0
so, to get the value of r (radius), use the formula :