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3.6 Integration (A-level only)

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Question 78
a.

Using the substitution u=3x+1u = \sqrt{3x+1}u=3x+1​, show that

∫1512x+4e3x+1 dx \int_{1}^{5} \sqrt{12x+4} e^{\sqrt{3x+1}} \, dx ∫15​12x+4​e3x+1​dx

may be expressed in the form

∫abku2eu du \int_{a}^{b} k u^2 e^u \, du ∫ab​ku2eudu

where aaa, bbb and kkk are constants to be found.

[4]
b.

Hence find, by algebraic integration, the exact value of

∫1512x+4e3x+1 dx \int_{1}^{5} \sqrt{12x+4} e^{\sqrt{3x+1}} \, dx ∫15​12x+4​e3x+1​dx

giving your answer in simplest form.

[4]
Markscheme

3.6 Integration (A-level only) Questions

  1. A Level
  2. /Maths
  3. /3.6 Integration (A-level only)

363 exam-style questions on CCEA A Level Maths 3.6 Integration (A-level only), covering 3.6.1 Integration (A-level only), 3.6.2 Integration (A-level only), 3.6.3 Integration (A-level only), 3.6.4 Integration (A-level only), 3.6.5 Integration (A-level only), 3.6.6 Integration (A-level only), and 3.6.7 Integration (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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