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Show that the equation 9x^(2) - 16y^(2) ...

Show that the equation `9x^(2) - 16y^(2) - 18x - 64y - 199 = 0` represents the equation of a hyperbola, find the coordinates of its centre and foci and also the equations of its directrices

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The correct Answer is:
(1,-2), (6,-2) and (-4,-2), 5x = 21 and 5x + 11 = 0
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