The sequence ${x_1}{\text{ }},{\text{ }}{x_2}{\text{ }},{\text{ }}{x_3}{\text{ }},{\text{ }}.{\text{ }}.{\text{ }}.$ defined by
${x_1} = 1$, ${x_{n + 1}} = \frac{1}{2}\sqrt[3]{{x_n^2 + 6}}$
converges to the value $\alpha $.
a) Find the value of $\alpha $ correct to 3 decimal places. Show your working, giving each calculated value of the sequence to 5 decimal places.
b) Find, in the for $\alpha {x^3} + b{x^2} + c = 0$, an equation of which $\alpha $ is a root.
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