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Find the Directrices of the Ellipse 16x2+81y2=129616 x ^ { 2 } + 81 y ^ { 2 } = 1296

Question 263

Multiple Choice

Find the directrices of the ellipse.
- 16x2+81y2=129616 x ^ { 2 } + 81 y ^ { 2 } = 1296


A) x=±8197x = \pm \frac { 81 } { \sqrt { 97 } }
B) y=±965y = \pm \frac { 9 } { \sqrt { 65 } }
C) y=±8165y = \pm \frac { 81 } { \sqrt { 65 } }
D) x=±8165x = \pm \frac { 81 } { \sqrt { 65 } }

Correct Answer:

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