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\begin{frame}
  \frametitle{Polynomials of Degree 3: Cubic Functions}
  
  \begin{block}{}
    A polynomial of degree $3$ is a \emph{cubic function}:\vspace{-.5ex}
    \begin{talign}
      f(x) = ax^3 + bx^2 + cx + d
    \end{talign}\vspace{-3ex}
  \end{block}\medskip

  \begin{center}
  \scalebox{.6}{
  \begin{tikzpicture}[default]
    \diagram{-2}{2}{-2}{3}{1}
    \diagramannotatez
    \diagramannotatex{-1,1}
    \diagramannotatey{-1,1}
    \draw[cblue,ultra thick] plot[smooth,domain=-1.67:1.53,samples=20] (\x,{pow(\x,3)-\x+1});
  \end{tikzpicture}
  }\\
  {\small $x^3-x+1$}
  \end{center}
\end{frame}