Question

question :
how can i determinate the rayon and the center of a circle of the equation (C):y²+2y+x²+x=0
plz help :)

Answer 1

complete the sqr of y and x by adding some number to both sides of the equation, after then, the (x - number1)^2 +(y-number2)^2 = number 3. number 1 and number2 is the center , sqr of number3 is radius.
hope this help and hope you can continue