- (a) "If \(m\) and \(n\) are irrational numbers, where \(m \neq n\), then \(m n\) is also irrational."
Disprove this statement by means of a counter example.
(b) (i) Sketch the graph of \(y = | x | + 3\)
(ii) Explain why \(| x | + 3 \geqslant | x + 3 |\) for all real values of \(x\).