Question

Is 3i a complex number

Answer 1

Remember that a complex number has the form a + bi. You need to figure out what a and b need to be. 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

Yes

Step-by-step explanation

The number

`3i`

can be rewritten as

`0 + 3i`This is of ty form

`z = a + bi`

where 0 is the real part and 3i is the imaginary or complex part.

`3i`

is therefore a complex number. It is purely imaginary because the real part is zero.