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Let λ x – 2y = μ be a tangent to the hyperbola a 2 x 2 – y 2 = b 2 . Then 2 2 b a ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ μ − ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ λ is equal to :

1. –2
2. –4
3. 2
4. 4

Correct answer: 4

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