1.2 Algebra and Functions

a.

Prove that for positive values of $a\,$ and $b$

\frac{9a}{b} + \frac{4b}{a} \geq 12

[4]

b.

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

[2]

a.

Prove that for positive values of $a\,$ and $b$

\frac{9a}{b} + \frac{4b}{a} \geq 12

[4]

b.

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

[2]

1.2 Algebra and Functions Questions