JEE Advanced Mathematics question
The graph of the curve falls wholly in
Answer: (A)
Solution
As a quadratic in : . Its discriminant is
(2y+ - - 8y + 32) = 64y - 64 = 64(y-1),
so real needs , and then
x = = y + 4 ± 4 = ( ± + 1 \ 1 > 0.
By symmetry (the equation is symmetric in
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