H2 Maths Notes (JC 1-2): 4.1) Complex Numbers and Argand Diagrams

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07 Oct 2025, 00:00 Z

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Marcus Pang·Managing Director (Maths)

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Q: What does H2 Maths Notes (JC 1-2): 4.1) Complex Numbers and Argand Diagrams cover?
A: Cartesian-form complex numbers, Argand diagrams, loci, and the algebra you need for Topic 4.1.

Before you revise
Stick to Cartesian $x + iy$: for the 2026 syllabus, complex numbers in polar/exponential form (and De Moivre workflows) are excluded. Focus on modulus/argument, conjugates, quadratic roots, and Argand-diagram geometry.

Status: SEAB H2 Mathematics (9758, first exam 2026) syllabus last checked 2026-01-13 (PDF last modified 2024-10-16). Topic 4.1 uses Cartesian form + Argand geometry; polar/exponential representations are excluded.

Core Definitions

• Complex number $z = x + iy$ with real part $x$