SOLUTION: Find the co-ordinates of the foci, the eccentricity and the equations of the directrices of the hyperbola 4x 2 � 9y2 = 36.

SOLUTION: Find the co-ordinates of the foci, the eccentricity and the equations of the directrices of the hyperbola 4x 2 � 9y2 = 36.

Algebra.Com

Question 439715: Find the co-ordinates of the foci, the
eccentricity and the equations of the
directrices of the hyperbola 4x 2 � 9y2 = 36.
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!

after division by 36.
==> and
Now for the hyperbola, and so .
==> .
==> The foci are (, 0) and (, 0).
Now c = ae ==> , the eccentricity.
==> the directrices are and

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