\(\left(x-3\right)\left(x^2+1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x^2+1=0\end{cases}}\)
\(\Rightarrow x=3\)
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\(\left(x-3\right)\left(x^2+1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x^2+1=0\end{cases}}\)
\(\Rightarrow x=3\)