If α, β are zeroes of the polynomial 8x2 - 5x - 1 , then form a quadratic polynomial in x whose zeroes are 2/α and 2/β .

CBSE Class 10 Maths PYQ · Polynomials · Relationship of Zeros and Coefficients · 3 Marks · March 2025 · Basic

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1423 Marks · March 2025 · Basic
If $\alpha, \beta$ are zeroes of the polynomial $8x^2 - 5x - 1$, then form a quadratic polynomial in $x$ whose zeroes are $\frac{2}{\alpha}$ and $\frac{2}{\beta}$.
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$p(x) = 8x^2 - 5x - 1$
$\alpha + \beta = \frac{5}{8}, \alpha\beta = \frac{-1}{8}$ ($\frac{1}{2} + \frac{1}{2}$ marks)
$\therefore \text{sum of zeroes} = \frac{2}{\alpha} + \frac{2}{\beta} = -10$ ($\frac{1}{2}$ mark)
$\text{and product of zeroes} = \frac{2}{\alpha} \times \frac{2}{\beta} = -32$ ($\frac{1}{2}$ mark)
$\text{Required polynomial} = x^2 + 10x - 32$ (1 mark)
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