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If the curves y 2 = 6 x , 9 x 2 + b y 2 = 16 intersect each other at right angles, then the value of b is :

1. 6
2. 2 7
3. 4
4. 2 9 Students may find same question in CP exercise sheet : [ JEE Main, Chapter : Tangent & Normal, Ex. 2, Q. No. 10 ]

Correct answer: 2 9 Students may find same question in CP exercise sheet : [ JEE Main, Chapter : Tangent & Normal, Ex. 2, Q. No. 10 ]

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