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Numerical Methods

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Question 5

The curve C has the equation y=(8−x)ln⁡xy = (8 - x) \ln xy=(8−x)lnx, x>0x > 0x>0

a.

Find dydx\displaystyle \frac{dy}{dx}dxdy​

[3]
b.

C has a stationary point at P. Show that the x x\,x coordinate of P lies between 3.5 and 3.6

[3]
c.

Show that the x x\,x coordinate of P is a solution of x=81+ln⁡x\displaystyle x = \frac{8}{1 + \ln x}x=1+lnx8​

[3]
d.

Use the iteration formula xn+1=81+ln⁡xn\displaystyle x_{n+1} = \frac{8}{1 + \ln x_n}xn+1​=1+lnxn​8​ with x0=3.55x_0 = 3.55x0​=3.55 to find, to 3 decimal places, the values of x1x_1x1​, x2 x_2\,x2​ and x3x_3x3​.

[3]
Markscheme

Numerical Methods Questions

  1. A Level
  2. /Maths
  3. /Numerical Methods

329 exam-style questions on Edexcel A Level Maths Numerical Methods, covering 10.1 Locating Roots, 10.2 Iteration, 10.3 The Newton-Raphson Method, and 10.4 Applications to Modelling. Each one has a worked solution and a mark scheme showing where the marks go.

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