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If the tangent at the point (x 1 , y 1 ) on the curve y = x 3 + 3x 2 + 5 passes through the origin, then (x 1 , y 1 ) does NOT lie on the curve :

1. x 2 + 81 y 2 = 2
2. 9 y 2 – x 2 = 8
3. y = 4x 2 + 5
4. 3 x – y 2 = 2

Correct answer: 3 x – y 2 = 2

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