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How many `(i)` maximum `(ii)` minimum number of zeroes can a quadratic polynomial have ?

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To determine the maximum and minimum number of zeros that a quadratic polynomial can have, we need to understand the nature of quadratic polynomials. ### Step-by-step Solution: 1. **Definition of a Quadratic Polynomial**: A quadratic polynomial is generally expressed in the form: \[ f(x) = ax^2 + bx + c \] where \(a\), \(b\), and \(c\) are constants and \(a \neq 0\). The degree of this polynomial is 2. **Hint**: Remember that the degree of a polynomial indicates the highest power of the variable in the polynomial. 2. **Understanding the Relationship Between Degree and Zeros**: The Fundamental Theorem of Algebra states that a polynomial of degree \(n\) can have at most \(n\) roots (or zeros). Therefore, for a quadratic polynomial (degree 2), it can have at most 2 zeros. **Hint**: The maximum number of zeros is equal to the degree of the polynomial. 3. **Finding the Minimum Number of Zeros**: A quadratic polynomial can also have fewer than 2 zeros. Specifically: - It can have 2 distinct real zeros (roots). - It can have 1 real zero (a repeated root). - It can have no real zeros (but 2 complex zeros). Thus, the minimum number of zeros a quadratic polynomial can have is 0. **Hint**: Consider the nature of the roots: they can be real or complex, and sometimes they can repeat. 4. **Conclusion**: - **Maximum number of zeros**: 2 - **Minimum number of zeros**: 0 ### Final Answer: (i) Maximum number of zeros: **2** (ii) Minimum number of zeros: **0**
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Knowledge Check

  • The maximum number of zeroes a cubic polynomial can have, is

    A
    1
    B
    4
    C
    2
    D
    3
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