Prove that for positive values of a a\,a and bbb
9ab+4ba≥12 \frac{9a}{b} + \frac{4b}{a} \geq 12 b9a+a4b≥12Prove, by counter example, that this is not true for all values of a a\,a and bbb.
Practise Edexcel AS Level Maths Algebraic Methods with exam-style questions for AS Level Maths. 35 questions covering 7.1 Algebraic Fractions, 7.2 Dividing Polynomials, 7.3 The Factor Theorem, 7.4 Mathematical Proof, and 7.5 Methods of Proof, matched to the Edexcel AS Level Maths (8MA0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.