If α , β are the roots of the equation x 2 - 5 + 3 log 3 5 - 5 log 5 3 x + 3 3 log 3 5 1 3 - 5 log…
Solution
Given are the roots of the equation
Now
Also
So, given equation becomes
i.e.
Now if the roots are $\alpha + \frac{1}{\beta}$ and $\beta + \frac{1}{\alpha}$ i.e., $\frac{\alpha \beta + 1}{\beta}$ and $\frac{\alpha \beta + 1}{\alpha}$ i.e., $-\frac{2}{\beta}$ and $-\frac{2}{\alpha}$ Then let $-\frac{2}{\alpha} = t so \alpha = -\frac{2}{t}$ As $\alpha^2 - 5\alpha - 3 = 0$ Then $(-\frac{2}{t})^2 - 5(-\frac{2}{t}) - 3 = 0$ Which simplifies to $\frac{4}{t^2} + \frac{10}{t} - 3 = 0$ And further simplifies to $3t^2 - 10t - 4 = 0$ i.e., $3x^2 - 10x - 4 = 0$ is the required equation.
Asked in: JEE Main 2022 (27 Jul Shift 2)