Question 337573
Complete the square in x and y.
{{{16x^2-96x+9y^2+18y=-9}}}
{{{16(x^2-6x)+9(y^2+2y)=-9}}}
{{{16(x^2-6x+9)+9(y^2+2y+1)=-9+16(9)+9(1)}}}
{{{16(x-3)^2+9(y+1)^2=144}}}
{{{highlight((x-3)^2/9+(y+1)^2/16=1)}}}