Question

i) Write the real part of the complex numbers - 3i.​

Answer 1

Answer:

Since −3i is an imaginary number, it is the imaginary part (bi) of the complex number a + bi. This imaginary number has no real parts, so the value of a is 0.

Answer 2

The real part of the given complex number is 0.

• A complex number $z$ is written in the form $z=a+ib$ where $i=\sqrt{-1}$.
• In this number, $a$ is called the real part of $z$ and $b$ is called the imaginary part of $z$.
• We are given a complex number $z=-3i$. This can be written as $z=0+i(-3)$.
• So the real part of the complex number is 0 and the imaginary part is -3.