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Plz can someone tell me i have attached my question

Plz can someone tell me i have attached my question

Question Image
Grade:11

2 Answers

Chirag Vaswani
39 Points
4 years ago
The discriminant is zero beacause:
we are having a quadratic equation in x, and we say that the line is a tangent to the curve, so to satisfy the condition of being a tangent the line must meet the curve only at one point, so there can be only one solution for x, hence dicriminant must be zero
Punit
44 Points
4 years ago
Here the line must be a tangent,so to satisfy the condition the should have only one solution and therefore the discriminant must be 0.

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