Re: HSC 2015 4U Marathon
\mathrm{Use\, the\, properties\, of\, the\, complex\, conjugates\, to\, show\, that\, if\, \mathit{a}\, and \mathit{b}\, are\, real\, and \, |z|\, =1, then\, show\, |\mathit{a}+\mathit{bz|}=|\mathit{az+b|}}
Edit: Reference from MATH1131 booklet