TeX source:

\begin{array}{lll} \text { Beginning estimate: } & \mathrm{x}_{0}=4 & & \text { (} 0 \text { correct digits) } \\ \text { after } 1 \text { iteration: } & \mathrm{x}_{1}=\underline{2.625} & & \text { (} 1 \text { correct digit }) \\ \text { after } 2 \text { iterations: } & \mathrm{x}_{2}=\underline{2.262880952} & & \text { (} 2 \text { correct digits) } \\ \text { after 3 iterations: } & \mathrm{x}_{3}=\underline{2.236251252} & & \text { (} 4 \text { correct digits) } \\ \text { after 4 iterations: } & \mathrm{x}_{4}=\underline{2.236067985} & & \text { (} 8 \text { correct digits) } \end{array}