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If 5x + 9 = 0 is the directrix of the hyperbola 16x 2 – 9y 2 = 144, then its corresponding focus is :

1. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 0 , 3 5
2. (5, 0)
3. (–5, 0)
4. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − 0 , 3 5

Correct answer: (–5, 0)

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