FP1.1.2 - Sum, product and quotient of complex numbers

Sum, product and quotient of | z z | = | z | | z | 1 2 1 2 complex numbers.; Knowledge of the result arg(z z) = arg z + arg z is not 1 2 1 2 required.

Use fp1.1.2 - sum, product and quotient of complex numbers to connect the rule to the data and decision in the question.

This matters because fp1.1.2 - sum, product and quotient of complex numbers determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply fp1.1.2 - sum, product and quotient of complex numbers to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: FP1.1.2 - Sum, product and quotient of complex numbers is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.