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Tangents of slope 1 to x²/16 − y²/9 = 1 are
Ay = x ± 5
By = x ± √7
Cy = x ± 25
Dy = x ± 7
Answer & Solution
Correct answer: B. y = x ± √7
c² = a²m² − b² = 16 − 9 = 7, so c = ±√7.
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