Exercício Resolvido de Inequações
a)
\( (x-3).(-x+4)>0 \)
\[
(\underbrace{x-3}_{A}).(\underbrace{-x+4}_{B})>0
\]
\[
\begin{gathered}
x-3=0\\
x=3
\end{gathered}
\]
\[
\begin{gathered}
-x+4=0\\
x=4
\end{gathered}
\]
\[ \bbox[#FFCCCC,10px]
{V=\left.\phantom{{}}\right]\;3;4\;\left[\phantom{{}}\right.}
\]