Get into form (x-h)²+(y-k)²=r² center is (h,k) and radius is r
complete the square for each (x²+4x)+(y²-6y)=-4 take 1/2 of each linear coefienet and square it 4/2=2, 2²=4 -6/2=-3, (-3)²=9 add that to both sides (x²+4x)+4+(y²-6y)+9=-4+4+9 (x²+4x+4)+(y²-6y+9)=9 complete the squares (x+2)²+(y-3)²=3² (x-(-2))²+(y-3)²=3²
