If 5x + 9 = 0 is the directrix of the hyperbola 16x2 – 9y2 = 144, then its corresponding focus is :

Question

If 5x + 9 = 0 is the directrix of the hyperbola 16x² – 9y² = 144, then its corresponding focus is :

$\left( {{5 \over 3},0} \right)$

(5, 0)

(- 5, 0)

$\left( { - {5 \over 3},0} \right)$

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