Question
$$-s^2-2s = 0$$
Answer
$$ \begin{matrix}s_1 = 0 & s_2 = -2 \\[1 em] \end{matrix} $$
Explanation
In order to solve $ \color{blue}{ -x^{2}-2x = 0 } $, first we need to factor our $ x $.
$$ -x^{2}-2x = x \left( -x-2 \right) $$$ x = 0 $ is a root of multiplicity $ 1 $.
The second root can be found by solving equation $ -x-2 = 0$.
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