\textbf{45--} The position--time equation of a particle in SI units is $x = 2t^2 - 12t + 8$, at moment $t = 0$. How many seconds after $t = 0$ is the particle's distance from the origin less than or equal to 8 meters?
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\noindent (1) $2$ \hfill (2) $3$ \hfill (3) $4$ \hfill (4) $6$
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