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Find the Directrices of the Ellipse 64x2+49y2=313664 x ^ { 2 } + 49 y ^ { 2 } = 3136

Question 111

Multiple Choice

Find the directrices of the ellipse.
- 64x2+49y2=313664 x ^ { 2 } + 49 y ^ { 2 } = 3136


A) y=±6415y = \pm \frac { 64 } { \sqrt { 15 } }
B) x=±6415x = \pm \frac { 64 } { \sqrt { 15 } }
C) x=±64113x = \pm \frac { 64 } { \sqrt { 113 } }
D) y=±4915y = \pm \frac { 49 } { \sqrt { 15 } }

Correct Answer:

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