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Directrices of x²/25 + y²/9 = 1?

Ax = ±4
Bx = ±9/4
Cx = ±25/4
Dx = ±5/4
Answer & Solution
Correct answer: C. x = ±25/4
The directrices are x = ±a/e = ±5/(4/5) = ±25/4.
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