Mathematics 9709 · AS & A Level · Numerical solution of equations

Numerical solution of equations — practice question

(i)[2]

By drawing appropriate graphs, demonstrate that the equation $x^3 = 11 - 2x$ has exactly one real root.

(ii)[3]

Apply the iterative formula $x_{n+1} = \sqrt[3]{(11 - 2x_n)}$ to determine the root correct to $4$ significant figures. Record the outcome of every iteration to $6$ significant figures.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: Sketch the graph of $y = x^3$

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