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The distance between the foci of the con...

The distance between the foci of the conic `7x^(2)-9y^(2)=63` is equal to

A

8

B

4

C

3

D

7

Text Solution

Verified by Experts

The correct Answer is:
A
Given equation of hyperbola is
`(x^(2))/(9)-(y^(2))/(7)=1`
Distance between foci
`=2ae=2sqrt(a^(2)+b^(2))`
`=2sqrt(9+7)=8`
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