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3.8.2 Numerical Methods (A-level only)

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Question 6

f(x)=ex+2+x−10f(x) = e^{x+2} + x - 10f(x)=ex+2+x−10

a.

Show that the equation f(x)=0f(x) = 0f(x)=0 can be written in the form x=ln⁡(10−x)−2x = \ln(10 - x) - 2x=ln(10−x)−2

[3]
b.

Use the iteration formula xn+1=ln⁡(10−xn)−2x_{n+1} = \ln(10 - x_n) - 2xn+1​=ln(10−xn​)−2 with x0=0.5x_0 = 0.5x0​=0.5 to find, to 3 decimal places, the values of x1x_1x1​, x2 x_2\,x2​ and x3x_3x3​.

[3]
c.

By choosing a suitable interval, prove that α=0.275\alpha = 0.275α=0.275 to 3 decimal places

[3]

3.8.2 Numerical Methods (A-level only) Questions

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