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Find the Directrices of the Ellipse 144x2+4y2=576144 x ^ { 2 } + 4 y ^ { 2 } = 576

Question 136

Multiple Choice

Find the directrices of the ellipse.
- 144x2+4y2=576144 x ^ { 2 } + 4 y ^ { 2 } = 576


A) x=±7235x = \pm \frac { 72 } { \sqrt { 35 } }
B) y=±7237y = \pm \frac { 72 } { \sqrt { 37 } }
C) y=±7235\mathrm { y } = \pm \frac { 72 } { \sqrt { 35 } }
D) x=±635x = \pm \frac { 6 } { \sqrt { 35 } }

Correct Answer:

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