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Mathematics
Problem
For the ellipse
x
2
9
+
y
2
25
=
1
\dfrac{x^{2}}{9}+\dfrac{y^{2}}{25}=1
9
x
2
+
25
y
2
=
1
, the coordinates of its foci are: a)
(
±
4
,
0
)
(\pm 4,\,0)
(
±
4
,
0
)
b)
(
0
,
±
3
)
(0,\,\pm 3)
(
0
,
±
3
)
c)
(
0
,
±
4
)
(0,\,\pm 4)
(
0
,
±
4
)
d)
(
0
,
±
5
)
(0,\,\pm 5)
(
0
,
±
5
)
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