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Solve the equation $x^3 - 28 + \frac{27}{x^3} = 0$ for $x$.
Mathematics 9709 · AS & A Level · Quadratics
Quadratics — practice question
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Multiply through by $x^3$ and write $u=x^3$: $u^2-28u+27=0$” …
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