cho f(x) = 0
\(=>3x-6=0\Rightarrow3x=6=>x=2\)
cho g(x) = 0
\(=>\left(x-3\right)\left(16-4x\right)=0\)
\(=>\left[{}\begin{matrix}x-3=0\\4x=16\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=4\end{matrix}\right.\)
cho k(x) = 0
\(=>x^2-81=0\Rightarrow\left[{}\begin{matrix}x=\sqrt{81}=9\\x=-\sqrt{81}=-9\end{matrix}\right.\)
cho m(x) = 0
\(=>x^2+7x-8=0\)
\(=>\left(x-1\right)\left(x+8\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-1=0\\x+8=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1\\x=-8\end{matrix}\right.\)
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