Straight Lines and Pair of Straight Lines

A point $P$ moves so that the sum of squares of its distances from the points $(1,2)$ and $(-2,1)$ is 14. Let $f(x, y)=0$ be the locus of $\mathrm{P}$, which intersects the $x$-axis at the points $\mathrm{A}$, $\mathrm{B}$ and the $y$-axis at the points C, D. Then the area of the quadrilateral ACBD is equal to :