4-2.Quadratic Equations and Inequations
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જો $\alpha $, $\beta$, $\gamma$  એ સમીકરણ ${x^3} - 2{x^2} + 3x - 2 = 0$ ના બીજો હોય તો $\left( {\frac{{\alpha \beta }}{{\alpha  + \beta }} + \frac{{\alpha \gamma }}{{\alpha  + \gamma }} + \frac{{\beta \gamma }}{{\beta  + \gamma }}} \right)$ ની કિમત મેળવો 

A

$\frac{{13}}{4}$

B

$\frac{{25}}{18}$

C

$\frac{{9}}{2}$

D

એક પણ નહી 

Solution

$x^{3}-2 x^{2}+3 x-2=(x-1)\left(x^{2}-x+2\right)$

$\alpha=1, \beta+\gamma=1, \beta \gamma=2$

$\frac{\alpha \beta}{\alpha+\beta}+\frac{\alpha \gamma}{\alpha+\gamma}+\frac{\beta \gamma}{\beta+\gamma}=\frac{\beta}{1+\beta}+\frac{\gamma}{1+\gamma}+2$

$=\frac{5}{4}+2=\frac{13}{4}$

Standard 11
Mathematics

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