Exercício Resolvido de Inequações
b)
\( 9x^{2}-6x+1\leqslant 0 \)
\[
\begin{gathered}
9x^{2}-6x+1=0\\[5pt]
\Delta=b^{2}-4ac=(-6)^{2}-4.9.1=36-36=0\\[5pt]
t=\frac{-b\pm\sqrt{\Delta \;}}{2a}=\frac{-(-6)\pm\sqrt{0\;}}{2.9}=\frac{6}{18}\\[5pt]
x=\frac{1}{3}
\end{gathered}
\]
\[ \bbox[#FFCCCC,10px]
{V=\left\{\frac{1}{3}\right\}}
\]