Complex number where the real part is zero and the imaginary part is not zero.

Number of the form

*b*i where*b*≠ 0.### Examples

- \(\sqrt{−1}\) is an imaginary number.
- \(5\sqrt{−7}\) is an imaginary number.

Complex number where the real part is zero and the imaginary part is not zero.

Number of the form *b*i where *b* ≠ 0.

- \(\sqrt{−1}\) is an imaginary number.
- \(5\sqrt{−7}\) is an imaginary number.