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Mathematics
Problem
Which of the following equations represents a hyperbola whose eccentricity is exactly
2
2
2
? a)
x
2
27
−
y
2
9
=
1
\dfrac{x^{2}}{27}-\dfrac{y^{2}}{9}=1
27
x
2
−
9
y
2
=
1
b)
x
2
9
−
y
2
36
=
1
\dfrac{x^{2}}{9}-\dfrac{y^{2}}{36}=1
9
x
2
−
36
y
2
=
1
c)
x
2
9
−
y
2
27
=
1
\dfrac{x^{2}}{9}-\dfrac{y^{2}}{27}=1
9
x
2
−
27
y
2
=
1
d)
x
2
16
−
y
2
28
=
1
\dfrac{x^{2}}{16}-\dfrac{y^{2}}{28}=1
16
x
2
−
28
y
2
=
1
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