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The equation \( 3 x^{2}+3 k x+k=0 \) where \( k \) is ion-zero constant, has roots \( \alpha \) and \( \beta \). find the quadratic equation whose oots are \( \frac{\alpha^{2}}{\beta\left(\alpha^{3}+\beta^{3}+k^{3}\right)} \) and \( \frac{\beta^{2}}{\alpha\left(\alpha^{3}+\beta^{3}+k^{3}\right)} \)

Ask by Lyons Vega. in Nigeria
Jan 01,2025

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Tutor-Verified Answer

Answer

The quadratic equation with roots \( \frac{\alpha^{2}}{\beta\left(\alpha^{3}+\beta^{3}+k^{3}\right)} \) and \( \frac{\beta^{2}}{\alpha\left(\alpha^{3}+\beta^{3}+k^{3}\right)} \) is: \[ 3k^3x^2 - 9k^2(1 - k)x + 1 = 0 \]

Solution

To find the quadratic equation with roots \[ r = \frac{\alpha^{2}}{\beta\left(\alpha^{3}+\beta^{3}+k^{3}\right)} \quad \text{and} \quad s = \frac{\beta^{2}}{\alpha\left(\alpha^{3}+\beta^{3}+k^{3}\right)}, \] we start with the given quadratic equation: \[ 3x^{2} + 3k x + k = 0 \] Let \(\alpha\) and \(\beta\) be the roots of this equation. Using Vieta's formulas: \[ \alpha + \beta = -\frac{3k}{3} = -k, \quad \alpha\beta = \frac{k}{3} \] ### Step 1: Simplify the Expressions for \(r\) and \(s\) First, we compute \(\alpha^3 + \beta^3\): \[ \alpha^3 + \beta^3 = (\alpha + \beta)^3 - 3\alpha\beta(\alpha + \beta) = (-k)^3 - 3\left(\frac{k}{3}\right)(-k) = -k^3 + k^2 \] Thus, \[ \alpha^3 + \beta^3 + k^3 = (-k^3 + k^2) + k^3 = k^2 \] Now, compute \(r + s\): \[ r + s = \frac{\alpha^2}{\beta k^2} + \frac{\beta^2}{\alpha k^2} = \frac{\alpha^3 + \beta^3}{\alpha\beta k^2} = \frac{-k^3 + k^2}{\frac{k}{3} \cdot k^2} = \frac{3(1 - k)}{k} \] Next, compute \(rs\): \[ rs = \frac{\alpha^2}{\beta k^2} \cdot \frac{\beta^2}{\alpha k^2} = \frac{\alpha\beta}{k^4} = \frac{\frac{k}{3}}{k^4} = \frac{1}{3k^3} \] ### Step 2: Form the Quadratic Equation The quadratic equation with roots \(r\) and \(s\) is: \[ x^2 - (r + s)x + rs = 0 \] Substituting the values of \(r + s\) and \(rs\): \[ x^2 - \frac{3(1 - k)}{k}x + \frac{1}{3k^3} = 0 \] To eliminate the fractions, multiply through by \(3k^3\): \[ 3k^3 x^2 - 9k^2(1 - k) x + 1 = 0 \] ### Final Answer After simplifying, an appropriate equation is  3 k³ x² – 9 k²(1 – k)x + 1 = 0. In other words, 3k³x² − 9k²(1−k)x + 1 = 0

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Bonus Knowledge

To find the quadratic equation whose roots are given as \( \frac{\alpha^{2}}{\beta(\alpha^{3}+\beta^{3}+k^{3})} \) and \( \frac{\beta^{2}}{\alpha(\alpha^{3}+\beta^{3}+k^{3})} \), we will first need to calculate the sum and product of the roots. Using Vieta's formulas on the original quadratic, the sum \( S \) and product \( P \) of roots \( \alpha \) and \( \beta \) can be derived as follows: 1. The sum of the roots \( S = \alpha + \beta = -\frac{3k}{3} = -k \). 2. The product of the roots \( P = \alpha \beta = \frac{k}{3} \). Next, we calculate the new required sum and product: - The new sum of roots: \[ S' = \frac{\alpha^{2}}{\beta(\alpha^{3}+\beta^{3}+k^{3})} + \frac{\beta^{2}}{\alpha(\alpha^{3}+\beta^{3}+k^{3})} = \frac{\alpha^3 + \beta^3}{\alpha\beta(\alpha^{3}+\beta^{3}+k^{3})} \] Using the identity \( \alpha^3 + \beta^3 = (\alpha + \beta)(\alpha^2 - \alpha\beta + \beta^2) = S(S^2 - 3P) \): \[ \alpha^3 + \beta^3 = -k((-k)^2 - 3\cdot\frac{k}{3}) = -k(k^2 - k) = -k^3 + k^2 \] Putting this into \( S' \): \[ S' = \frac{-k^3 + k^2}{\frac{k}{3}(\alpha^{3}+\beta^{3}+k^{3})} = \frac{-k(k - 1)}{(\alpha^{3}+\beta^{3}+k^{3})/3} \] - The new product of roots: \[ P' = \frac{\alpha^2\beta^2}{\alpha\beta(\alpha^{3}+\beta^{3}+k^{3})} = \frac{P^2}{\alpha^{3}+\beta^{3}+k^{3}} = \frac{\left( \frac{k}{3} \right)^{2}}{\alpha^{3}+\beta^{3}+k^{3}} \] Now, using the new sums \( S' \) and products \( P' \), the quadratic equation can be written in the form \( x^2 - S'x + P' = 0 \). Thus, the final quadratic equation will take the following form after substituting our values for \( S' \) and \( P' \). The process can be long, but with a consistent analysis of roots, you can generate the necessary equation accordingly!

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