The curve C C\,C has the equation y=(15−x)lnxy = (15 - x) \ln xy=(15−x)lnx, x>0x > 0x>0.
Find dydx\displaystyle \frac{dy}{dx}dxdy
C C\,C has a stationary point at PPP. Show that the xxx-coordinate of P P\,P lies between 5 and 6.
Show that the xxx-coordinate of P P\,P is a solution of x=151+lnx\displaystyle x = \frac{15}{1 + \ln x}x=1+lnx15.
Use the iteration formula xn+1=151+lnxn\displaystyle x_{n+1} = \frac{15}{1 + \ln x_n}xn+1=1+lnxn15 with x0=5.5x_0 = 5.5x0=5.5 to find, to 3 decimal places, the values of x1x_1x1, x2 x_2\,x2 and x3x_3x3.
Practise Edexcel A Level Maths Numerical Methods with exam-style questions for A Level Maths. 63 questions covering 10.1 Locating Roots, 10.2 Iteration, 10.3 The Newton-Raphson Method, and 10.4 Applications to Modelling, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.