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Sequences and Series

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Question 162

A sequence of sensor measurements P1,P2,P3,…P_1, P_2, P_3, \dotsP1​,P2​,P3​,… is defined by the recurrence relation

Pn+1=2(Pn−3)2−4,n≥1 P_{n+1} = 2(P_n - 3)^2 - 4, \quad n \ge 1 Pn+1​=2(Pn​−3)2−4,n≥1

where the first measurement is given by P1=k+3P_1 = k + 3P1​=k+3 and kkk is a constant.

a.

Find an expression for P2P_2P2​ in terms of kkk, giving your answer in its simplest form.

[2]
b.

Given that ∑n=13Pn=k+12\sum_{n=1}^{3} P_n = k + 12∑n=13​Pn​=k+12,

determine the possible values of P2P_2P2​.

[6]
Markscheme

Sequences and Series Questions

  1. A Level
  2. /Maths
  3. /Sequences and Series

326 exam-style questions on Edexcel A Level Maths Sequences and Series, covering 3.1 Arithmetic Sequences, 3.2 Arithmetic Series, 3.3 Geometric Sequences, 3.4 Geometric Series, 3.5 Sum to Infinity, 3.6 Sigma Notation, 3.7 Recurrence Relations, and 3.8 Modelling with Series. Each one has a worked solution and a mark scheme showing where the marks go.

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