`f(x) = 3x - 6=0`
`-> x = 2`
`h(x) = -5x + 30 =0`
`-> 30 =5x`
`-> x = 6`
`g(x) = (x-3)(16-4x)`
`4(x-3)(4-x) = 0`
`->` \(\left[{}\begin{matrix}x-3=0\\4-x=0\end{matrix}\right.\)
`->` \(\left[{}\begin{matrix}x=3\\x=4\end{matrix}\right.\)
`k(x) = x^2 - 81`
`-> (x-9)(x+9) =0`
`->` \(\left[{}\begin{matrix}x=9\\x=-9\end{matrix}\right.\)
`m(x) = (x-1)(x+8)=0`
`->` \(\left[{}\begin{matrix}x=1\\x=-8\end{matrix}\right.\)
`n(x) = (x+1)(5x+4)=0`
`->` \(\left[{}\begin{matrix}x=-1\\x=-\dfrac{4}{5}\end{matrix}\right.\)
\(f\left(x\right)=3x-6=0=>x=2\)
\(h\left(x\right)=-5x+30=0=>x=6\)
\(g\left(x\right)=\left(x-3\right)\left(16-4x\right)=0=>\left[{}\begin{matrix}x=3\\x=4\end{matrix}\right.\)
\(k\left(x\right)=x^2-81=0=>\left[{}\begin{matrix}x=9\\x=-9\end{matrix}\right.\)
\(m\left(x\right)=\left(x-1\right)\left(x+8\right)=0=>\left[{}\begin{matrix}x=1\\x=-8\end{matrix}\right.\)
\(n\left(x\right)=5\left(x+1\right)\left(x+4\right)=0=>\left[{}\begin{matrix}x=-1\\x=\dfrac{-4}{5}\end{matrix}\right.\)
