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Question 431

Schematic coordinate diagram with a horizontal x-axis, vertical y-axis, origin O, a curve crossing the x-axis to the right of a vertical line at x = 3, and region R between them.

The curve C C\,C with equation y=k−x(2x−3)(x+1)\displaystyle y = \frac{k - x}{(2x - 3)(x + 1)}y=(2x−3)(x+1)k−x​, where k>3k > 3k>3. The region R R\,R is bounded by the curve CCC, the xxx-axis and the line with equation x=3x = 3x=3.

Show that the exact value of the area of RRR, in terms of kkk, is 2k−310ln⁡(2k−33)−k+15ln⁡(k+14)\displaystyle \frac{2k-3}{10}\ln\left(\frac{2k-3}{3}\right)-\frac{k+1}{5}\ln\left(\frac{k+1}{4}\right)102k−3​ln(32k−3​)−5k+1​ln(4k+1​).

[8]
Markscheme

Integration Questions

  1. A Level
  2. /Maths
  3. /Integration

864 exam-style questions on Edexcel A Level Maths Integration, covering 11.1 Integrating Standard Functions, 11.2 Integrating f(ax + b), 11.3 Using Trigonometric Identities, 11.4 Reverse Chain Rule, 11.5 Integration by Substitution, 11.6 Integration by Parts, 11.7 Partial Fractions, 11.8 Finding Areas, 11.9 The Trapezium Rule, 11.10 Solving Differential Equations, and 11.11 Modelling with Differential Equations. Each one has a worked solution and a mark scheme showing where the marks go.

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