Question 450970
{{{x^2 - 28x - 4y^2 - 24y = -156}}}

{{{x^2 - 28x +196 -4(y^2 + 6y + 9) = -156 + 196 - 36 = 4}}}

{{{(x-14)^2 - 4(y + 3)^2 = 4}}}

{{{(x-14)^2/4 - (y+3)^2/1 = 1}}}