Question

Check: What are the directrices of the hyperbola given by the equation x^2/25-y^2/81=1?

My Answer: x=±(25√106)/106
Option 2: y=±(25√106)/106
Option 3: x=±(81√106)/106
Option 4: y=±(81√106)/106

Answer 1

hmm.... are you sure those are the correct choices?

Answer 2

yeah.

Answer 3

oh... sorry... directrices... i was thinking asymptotes..

Answer 4

Oh okay.

Answer 5

since the directrix is \(\large x=\frac{a^2}{c} \)
did you find the value for c?

Answer 6

106 right?

Answer 7

well \(\large c^2=106\rightarrow c=\sqrt{106} \)

Answer 8

yes... your answer looks right....:)

Answer 9

Thank You!

Answer 10

yw...:)