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If alpha and beta are the roots of x2 + x + 1 = 0, find p if the roots of x2 + px + q = 0 are (alpha)/(beta) and (beta)/(alpha).

Mathematics

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Answer

(B) 1\text{(B) } 1

Step-by-step solution

4 steps
  1. Use Vieta's formulas for the first equation.

    Given the equation x2+x+1=0x^2 + x + 1 = 0, with roots α\alpha and β\beta.
    The sum of the roots is α+β=−11=−1\alpha + \beta = -\frac{1}{1} = -1.
    The product of the roots is αβ=11=1\alpha \beta = \frac{1}{1} = 1.

  2. Use Vieta's formulas for the second equation.

    Given the equation x2+px+q=0x^2 + px + q = 0, with roots αβ\frac{\alpha}{\beta} and βα\frac{\beta}{\alpha}.
    The sum of these roots is αβ+βα=−p\frac{\alpha}{\beta} + \frac{\beta}{\alpha} = -p.

  3. Simplify the sum of the roots for the second equation.

    αβ+βα=α2+β2αβ\frac{\alpha}{\beta} + \frac{\beta}{\alpha} = \frac{\alpha^2 + \beta^2}{\alpha \beta}

    We know that α2+β2=(α+β)2−2αβ\alpha^2 + \beta^2 = (\alpha + \beta)^2 - 2\alpha\beta.
    Substitute the values from Step 1:

    α2+β2=(−1)2−2(1)=1−2=−1\alpha^2 + \beta^2 = (-1)^2 - 2(1) = 1 - 2 = -1

    Now substitute this back into the expression for the sum of the roots:

    α2+β2αβ=−11=−1\frac{\alpha^2 + \beta^2}{\alpha \beta} = \frac{-1}{1} = -1
  4. Equate the simplified sum to −p-p.

    From Step 2, we have αβ+βα=−p\frac{\alpha}{\beta} + \frac{\beta}{\alpha} = -p.
    From Step 3, we found that αβ+βα=−1\frac{\alpha}{\beta} + \frac{\beta}{\alpha} = -1.
    Therefore,

    −p=−1-p = -1 p=1p = 1

    The value of pp is 1. This corresponds to option (B).

    The final answer is (B) 1\text{(B) } 1.

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