Answer
$4$, $1$, $16$
Work Step by Step
Rewrite the equation as
$3(x^2+4x+4)+4(y^2-2y+1)=32+12+4$
or
$3(x+2)^2+4(y-1)^2=48$
This means that we complete the square on $x$ by adding $4$ within the first parentheses. Similarly, we complete the square on $y$ by adding $1$ within the second parentheses. At the same time, we must add $16$ to the right side of the equation.
