The equations of the directrices of the ellipse $16{x^2} + 25{y^2} = 400$ are
The equations of the directrices of the ellipse $16{x^2} + 25{y^2} = 400$ are
- A
$2x = \pm 25$
- B
$5x = \pm 9$
- C
$3x = \pm 10$
- D
None of these
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