Question 191572
4x^2+y^2-8x-2y-4=0
:
{{{4(x^2-2x+1)+(y^2-2y+1)-4-1-4=0}}}
:
{{{4(x-1)^2+(y-1)^2=9}}}
:
{{{4(x-1)^2/9+(y-1)^2/9=1}}}