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Plz tell i have attached my question i am having a big trouble in understanding this someone plz help me

Plz tell i have attached my question i am having a big trouble in understanding this someone plz help me

Question Image
Grade:11

1 Answers

Chirag Vaswani
39 Points
3 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.

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