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The question asks which of the given graphs is not a graph of a quadratic polynomial (द्विघात बहुपद). Let's analyze each option to determine which one does not represent a quadratic polynomial:

### Analysis of Options:

1. **Option A (ए):**  
   The graph is a parabola opening upwards. This shape is characteristic of a quadratic function, such as \(y = ax^2 + bx + c\), where \(a > 0\).  

2. **Option B (बी):**  
   The graph is also a parabola, but it opens downwards. This is another typical shape of a quadratic function, \(y = ax^2 + bx + c\), where \(a < 0\).  

3. **Option C (सी):**  
   This graph represents another parabola that opens downwards. This, too, is a valid representation of a quadratic function.

4. **Option D (डी):**  
   The graph shows a curve that has two turning points (a point where it goes from increasing to decreasing or vice versa). This is not a characteristic of a quadratic polynomial, but rather of a cubic polynomial (degree 3) or higher.

### Conclusion:

The graph in **Option D (डी)** is **not** a graph of a quadratic polynomial. Therefore, the correct answer is **Option D (डी)**.

Would you like more details or have any questions about this solution?

### Related Questions to Explore:

1. What is the general form of a quadratic polynomial?
2. How can you identify the vertex of a parabola?
3. What distinguishes a cubic polynomial graph from a quadratic one?
4. How do the coefficients of a quadratic equation affect the shape of its graph?
5. What are the methods to find the roots of a quadratic equation?

**Tip:** When analyzing graphs, look at the number of turning points to determine the degree of the polynomial. A quadratic polynomial has at most one turning point, while a cubic polynomial has up to two.

निम्नलिखित में से कौन सा द्विघात बहुपद का ग्राफ नहीं है?

In this problem, learn how to differentiate between quadratic and non-quadratic polynomial graphs. The solution explores key algebraic concepts such as quadratic equations, their graphs, and how to recognize cubic polynomials.

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