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1.3 Functions

1.3 Functions

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Question 85

The internal pressure P P\,P of a experimental gas chamber is modeled by the function:

P(v)=3v3+13v2+19v+k P(v) = 3v^3 + 13v^2 + 19v + k P(v)=3v3+13v2+19v+k

where v v\,v is the relative volume and k k\,k is a constant.

Given that (3v+1)(3v + 1)(3v+1) is a factor of P(v)P(v)P(v),

a.

use the factor theorem to show that k=5k = 5k=5.

[2]
b.

Hence show that the equation P(v)=0P(v) = 0P(v)=0 has only one real root.

[4]
Markscheme

1.3 Functions Questions

  1. A Level
  2. /Maths
  3. /1.3 Functions

181 exam-style questions on OCR (MEI) A Level Maths 1.3 Functions, covering 1.3.1 Operations on polynomials, 1.3.2 Factor theorem, 1.3.3 Definition of a function (A-level only), 1.3.4 Composite functions (A-level only), 1.3.5 Inverse functions and their graphs (A-level only), 1.3.6 The modulus function (A-level only), 1.3.7 Inequalities with a modulus sign (A-level only), and 1.3.8 Functions in modelling (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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