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Question 7
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Analytic Geometry
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Question
The hyperbola
x
y
=
25
xy=25
x
y
=
25
is tangent to the ellipse
x
2
a
2
+
y
2
=
1
\frac{x^2}{a^2}+y^2=1
a
2
x
2
+
y
2
=
1
. Find
a
a
a
if
a
>
0
a>0
a
>
0
.
A.
50
B.
25
C.
5
D.
2
E.
NOTA
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