Question 1191097



{{{x^2+y^2-2x+8y+7=0}}}

{{{x^2-2x+y^2+8y=-7}}}

{{{(x^2-2x)+(y^2+8y)=-7}}}.........complete squares

{{{(x^2-2x+b^2)-b^2+(y^2+8y+b^2)-b^2=-7}}}

{{{(x^2-2x+1^2)-1^2+(y^2+8y+4^2)-4^2=-7}}}

{{{(x-1)^2-1+(y+4)^2-16=-7}}}

{{{(x-1)^2+(y+4)^2-17=-7}}}

{{{(x-1)^2+(y+4)^2=-7+17}}}

{{{(x-1)^2+(y+4)^2=10}}}-> answer: {{{circle}}}


{{{ graph( 600, 600, -10, 10, -10, 10, -sqrt(-x^2+2x+9)-4,sqrt(-x^2+2x+9)-4) }}}