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# 2.06 Complex numbers

## Interactive practice questions

What type of number can be written in the form $a+bi$a+bi?

A whole number

A

A rational number

B

A complex number

C

A real number

D

A whole number

A

A rational number

B

A complex number

C

A real number

D
Easy
Less than a minute

What is a pure imaginary number?

Consider the complex number $-i\sqrt{10}$i10.

### Outcomes

#### N.CN.A.1

Know there is a complex number I such that i^2 = -1, and every complex number has the form a + bi with a and b real.

#### N.CN.A.2

Use the relation i^2 = -1 and the commutative, associative, and distributive properties to add, subtract, and multiply complex numbers.