ધારોકે $A=\left(\begin{array}{cc}1 & 2 \\ -2 & -5\end{array}\right)$ અને ધારોક $\alpha, \beta \in R$ એવાં છે કે જેથી $\alpha A^{2}+\beta A=2 I$, તો $\alpha+\beta$ નું મૂલ્ય ............ છે.
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