Tell me how to solve a problem on geometry .there is a question for finding the radius of circle from the given equationequation like : x^2+4x-y^2+5y=12

Dear student,

equation of circle

x ² + y ² + a x + b y = c

has center has coordinates (-a/2 , -b/2) and radius r such that r ² = c + (a/2) ² + (b/2) ²

substitute values to get the answer !!