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Find a quadratic polynomial each with the given numbers as the sum and product of zeroes respectively:

Question

Find a quadratic polynomial each with the given numbers as the sum and product of zeroes respectively:

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Solution

To find a quadratic polynomial given the sum and product of its zeroes, we can use the standard form of a quadratic polynomial. The general form of a quadratic polynomial is:

p(x)=ax2+bx+c p(x) = ax^2 + bx + c

The relationships between the coefficients and the zeroes can be expressed as follows:

  1. The sum of the zeroes (α+β)(\alpha + \beta) is given by ba-\frac{b}{a}.
  2. The product of the zeroes (αβ)(\alpha \cdot \beta) is given by ca\frac{c}{a}.

Steps to find the quadratic polynomial

  1. Define Sum and Product: Let the sum of the zeroes be SS and the product of the zeroes be PP.

  2. Use the relationships: From the above definitions, we have:

    • S=baS = -\frac{b}{a}
    • P=caP = \frac{c}{a}
  3. Choose a value for aa: Typically, we can take a=1a = 1 for simplicity. This means:

    • b=Sb = -S
    • c=Pc = P
  4. Construct the polynomial: After determining bb and cc, substitute back into the polynomial form.

Example

Let's say the sum of the zeroes is S=5S = 5 and the product of the zeroes is P=6P = 6.

  1. Given:

    • S=5S = 5
    • P=6P = 6
  2. Using the relationships:

    • b=S=5b = -S = -5
    • c=P=6c = P = 6
  3. The quadratic polynomial becomes: p(x)=x25x+6 p(x) = x^2 - 5x + 6

Final Answer

The quadratic polynomial with the given sum and product of zeroes is:

p(x)=x25x+6 p(x) = x^2 - 5x + 6

This problem has been solved

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