\(\eqalign{
& {{{x^2}} \over 9} + {{{y^2}} \over 1} = 1 \cr
& {a^2} = 9;\,{b^2}\, = 1 \Rightarrow c = \sqrt {{a^2} - {b^2}} = 2\sqrt 2 \cr
& \Rightarrow \left\{ \matrix{
{F_1}( - 2\sqrt 2 ;\,0) \hfill \cr
{F_2}(2\sqrt 2 ;\,0) \hfill \cr} \right. \cr} \)
