Find the equation of the ellipse in the following cases:

Ends of major axis $(\pm 3,0),$ ends of minor axis $(0,\pm 2)$

Find the equation of the ellipse in the following cases:

Length of minor axis $16$ and foci $(0, \pm 6)$

Find the equation of the ellipse in the following cases:

$Foci(\pm 3,0), a=4$

Find the value of $ab-c$ in the equation of the ellipse $a{x}^2+b{y}^2+cx-dy+k=0$, whose centre is $(-2,3)$ and the length of whose semi-axes are $3$ and $2$, when major axis is parallel to $y$ -axis.