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Algebraic Methods

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Question 13
a.

Prove that for positive values of a a\,a and bbb

9ab+4ba≥12 \frac{9a}{b} + \frac{4b}{a} \geq 12 b9a​+a4b​≥12
[4]
b.

Prove, by counter example, that this is not true for all values of a a\,a and bbb.

[2]
Markscheme

Algebraic Methods Questions

  1. AS Level
  2. /Maths
  3. /Algebraic Methods

39 exam-style questions on Edexcel AS Level Maths Algebraic Methods, covering 7.1 Algebraic Fractions, 7.2 Dividing Polynomials, 7.3 The Factor Theorem, 7.4 Mathematical Proof, and 7.5 Methods of Proof. Each one has a worked solution and a mark scheme showing where the marks go.

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