CIE A Level Maths: Pure 3复习笔记8.1.1 Intro to Complex Numbers

Complex Numbers – Basics

What is an imaginary number?

What is a complex number?

Worked Example


Exam Tip

Complex Numbers – Basic Operations

How do I add and subtract complex numbers?

  • When adding and subtracting complex numbers, simplify the real and imaginary parts separately
    • Just like you would when collecting like terms in algebra and surds, or dealing with different components in vectors

How do I multiply complex numbers?

How do I deal with higher powers of i?

Worked Example


Exam Tip

  • Most calculators used at A-Level can work with complex numbers and you can use these to check your working.
  • You should still show your full working though to ensure you get all marks though.