x^2+y^2+6x-4=0x^2+y^2+6y-28=06x-6y+24=0x-y+4=0y=x+4x^2+(x+4)^2+6x-4=02x^2+14x+12=0x^2+7x+6=0(x+6)(x+1)=0x=-1,x=-6y=3,y=-2A(-1,3),B(-6,-2)圆心在AB的中垂线上（-7/2,1/2)k=1,k1=-1y-1/2=-(x+7/2)y=x-4x-4-1/2=-(x+7/2)2x=1x=1/2,y=-7/2R^2=(1/2+1)^2+(-7/2-3)^2=9/4+169/4=178/4=89/2R=(89/2)^1/2(x-1/2)^2+
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