# What is the sum of -i and i?

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### 1 Answer

To take the sum of -i and i, the operation that should be performed is addition.

`-i + i`

To add like terms, add the coefficients and copy the variable. Since there are no written numbers at the side of -i and i, it indicates that the coefficients are -1 and 1, respectively.

`= -1i + 1i`

`=(-1+1)i`

`=0i`

`=0`

**Therefore, the sum of -i and i is zero.**

**`-i + i = 0` **