# what is imaginary number

Dear Student,

An imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by its property i² = −1.

The square of an imaginary number bi is −b². For example, 5i is an imaginary number, and its square is −25.

​​​​​​Regards.

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Solve this the following transaction in a two column cash book

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a number that is expressed in terms of the square root of a negative number (usually the square root of ?1, represented by?i?or?j?).
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