If α and β are zeroes of the polynomial p(x) = x2 - 2x - 1 , then find the value of 1/2α + 1/2β + 3αβ .

CBSE Class 10 Maths PYQ · Polynomials · Relationship of Zeros and Coefficients · 2 Marks · March 2025 · Standard

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682 Marks · March 2025 · Standard
If $\alpha$ and $\beta$ are zeroes of the polynomial $p(x) = x^2 - 2x - 1$, then find the value of $\frac{1}{2\alpha} + \frac{1}{2\beta} + 3\alpha\beta$.
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$$\begin{aligned}& \alpha + \beta = 2 \\ & alpha\beta = -1 \\ & frac{1}{2\alpha} + \frac{1}{2\beta} + 3\alpha\beta = \frac{\alpha + \beta}{2\alpha\beta} + 3\alpha\beta \\ & = \frac{2}{2(-1)} + 3(-1) = -4\end{aligned}$$
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