Last updated on Oct 23, 2026

Adding & Subtracting (Leaving Cert Mathematics): Quizzes

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Adding & Subtracting

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What do you add together when adding complex numbers?

Real & imaginary parts separately

Given $z=11+4i$ and $w=9-7i$ , what is $z+w$ ?

$20-3i$

Given $z=11+4i$ and $w=9-7i$ , what is $z-w$ ?

$2+11i$

What must you account for when subtracting complex numbers?

The brackets

If $z_1=a+bi$ and $z_2=c+di$ , what is $z_1+z_2$ ?

$(a+c)+(b+d)i$

If $z_1=a+bi$ and $z_2=c+di$ , what is $z_1-z_2$ ?

$(a-c)+(b-d)i$

When computing $(11+4i)-(9-7i)$ , what does it simplify to before grouping?

$11+4i-9+7i$

What are the real parts in $z=11+4i$ and $w=9-7i$ ?

11 and 9

What are the imaginary parts in $z=11+4i$ and $w=9-7i$ ?

4 and -7

In $(11+4i)+(9-7i)$ , what is $(4-7)i$ equal to?

$-3i$

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 Flashcards 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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