\begin{frame} \frametitle{Newton's Method} \begin{center} \scalebox{.8}{ \begin{tikzpicture}[default,baseline=1cm] \diagram{-.5}{4}{-.5}{4}{1} \diagramannotatez \begin{scope}[ultra thick] \draw[cgreen,ultra thick] plot[smooth,domain=-0:3.3,samples=200] function{-.5 + (.5*x)**3}; \node[include=cgreen] (r) at (1.58,0) {}; \node[anchor=south east] at (r) {$r$}; \end{scope} \mpause[1]{ \draw[gray] (3.2,-.2) -- node[at start,below,black] {$x_1$} node[include=cred,at end] {} (3.2,{-.5 + (.5*3.2)^3}); } \mpause{ \tangent{4cm}{.5cm}{-.5 + (.5*\x)^3}{3.2} } \mpause{ \draw[gray] (2.28,-.2) -- node[at start,below,xshift=1mm,black] {$x_2$} (2.28,.2); } \end{tikzpicture} } \end{center} \begin{exampleblock}{Idea of Newton's Method} \begin{itemize} \pause \item Take an approximation $x_1$ of the root (a rough guess). \pause \item Compute the tangent $L_1$ at $(x_1,f(x_1))$. \pause \item The tangent $L_1$ is close to the curve\ldots so $x$-intercept of $L_1$ will be close the the $x$-intercept of the function. \end{itemize} \end{exampleblock} \pause We can repeat this procedure to get improve the approximation. \vspace{10cm} \end{frame}