The curve C has the equation y=(8−x)lnxy = (8 - x) \ln xy=(8−x)lnx, x>0x > 0x>0
Find dydx\displaystyle \frac{dy}{dx}dxdy
C has a stationary point at P. Show that the x x\,x coordinate of P lies between 3.5 and 3.6
Show that the x x\,x coordinate of P is a solution of x=81+lnx\displaystyle x = \frac{8}{1 + \ln x}x=1+lnx8
Use the iteration formula xn+1=81+lnxn\displaystyle x_{n+1} = \frac{8}{1 + \ln x_n}xn+1=1+lnxn8 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.
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.