10. The equation 2x³ + x² - 1 = 0 has exactly one real root. (a) Show that, for this equation, the Newton-Raphson formula can be written Xn+1 = 4x2 + x² + 1 6x2 + 2xn Using the formula given in part (a) with ₁ = 1 (b) find the values of x2 and 3 (c) Explain why, for this question, the Newton-Raphson method cannot be used with r.

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