JEE Advanced 2010 Mathematics question

Mathematics Solution of Triangles JEE Advanced 2010

Let ABC be a triangle such that and let a, b and c denote the lengths of the sides opposite to A, B and C respectively. The value(s) of x for which , and is (are)

(A)
(B)Correct
(C)
(D)

Answer: (B)

Solution

By the cosine rule, . Now . So $ = ⇒ + 2x - 1 = +x+1) ⇒

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Question ID VK-025771