alleryDifference of focal distances from any point on hyperbola x²/16 - y²/9 = 1:
A18
B8 (= 2a)
Csqrt(7)
D10
Answer & Solution
Correct answer: B. 8 (= 2a)
**Definition of hyperbola:** |d_F1 - d_F2| = 2a.
Here a² = 16, a = 4, 2a = 8. (Foci at (±5, 0) since c = sqrt(16+9) = 5.)
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