Final answer to the problem
$\frac{\left(a+1\right)\left(a-2\right)}{a}$
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Step-by-step Solution
Specify the solving method
1
Factor the trinomial $a^2-2-a$ finding two numbers that multiply to form $-2$ and added form $-1$
$\begin{matrix}\left(1\right)\left(-2\right)=-2\\ \left(1\right)+\left(-2\right)=-1\end{matrix}$
2
Thus
$\frac{\left(a+1\right)\left(a-2\right)}{a}$
Final answer to the problem
$\frac{\left(a+1\right)\left(a-2\right)}{a}$