1. An approximate solution to an equation is found using this iterative process.

   ${x}_{n+1}=\frac{{({x}_{n})}^{3}-3}{8}$ and ${x}_{1}=-1$

Work out the values of ${x}_{2}$and ${x}_{3}$

${x}_{2}$   = ........................

${x}_{3}$   = .........................