Last updated on Oct 23, 2026

Adding and Subtracting Complex Numbers (Leaving Cert Mathematics): Flashcards

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Adding and Subtracting Complex Numbers

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Two parts of a complex number

Real part and imaginary part

Definition of imaginary unit $i$

$i = \sqrt{-1}$

Value of $i^2$

$-1$

Simplify $\sqrt{-9}$

$3i$

Standard form of complex number

$a + bi$

In $a + bi$ , what is $a$ ?

Real part

In $a + bi$ , what is $b$ ?

Coefficient of imaginary part

How to add complex numbers?

Add real parts together, add imaginary parts together

How to subtract complex numbers?

Subtract real parts, subtract imaginary parts

Write real number $5$ as complex number

$5 + 0i$

Write pure imaginary $-6i$ in standard form

$0 - 6i$

Explore Leaving Cert Mathematics Revision Notes by Topics

Fundamentals of Complex Numbers

The Basics

Argand Diagrams & Modulus

Solving Equations

DeMoivre's Theorem

Transformations

Explore Leaving Cert Mathematics Model Answers by Topics

Fundamentals of Complex Numbers

The Basics

Argand Diagrams & Modulus

Solving Equations

DeMoivre's Theorem

Transformations

Explore Leaving Cert Mathematics Quizzes by Topics

Fundamentals of Complex Numbers

The Basics

Argand Diagrams & Modulus

Solving Equations

DeMoivre's Theorem

Transformations

Explore Leaving Cert Mathematics Exam Questions by Topics

Fundamentals of Complex Numbers

The Basics

Argand Diagrams & Modulus

Solving Equations

DeMoivre's Theorem

Transformations

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