Find the equation of a hyperbola if the foci at the points is (-3,5) and (5,5) and the length of the latus rectum is 2 root8
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Answer:Foci ( 3, 0), the latus rectum is of length 8.
Here, the foci are on x-axis.
Thus,
The equation of the hyperbola is of the form
Since, the foci are (), c=
Length of latus rectum = 8
⇒
⇒ b2 = 4a
We know that, a2 + b2 = c2
a2 + 4a = 45
⇒ a2 + 4a -45 = 0
⇒ a2 + 9a – 5a -45 = 0
⇒ (a +9)(a -5) = 0
⇒ A = -9,5
Since, a is non – negative, a = 5
Thus, b2 = 4a = 4 × 5 = 20
Hence, the equation of the hyperbola is
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