The IMSUM function returns the sum of two or more complex numbers in x + yi or x + yj text format. When adding complex numbers, the real and imaginary coefficients are added separately i.e., the equation to find the sum of two complex numbers a+bi and c + di is : (a + bi) + (c + di) = (a + c) + (b + d)i

**Syntax**:= IMSUM(inumber1, [inumber2], …)

The IMSUM function syntax has the following arguments:

**Inumber1, [inumber2], …**Inumber1 is required, subsequent numbers are not. 1 to 255 complex numbers to add

**Example**: Let’s look at some Excel IMSUM function examples and explore how to use the IMSUM function as a worksheet function in Microsoft Excel:

**Syntax**: =IMSUM(A2,B2)

**Result**:

Based on the Excel spreadsheet above, the following IMSUM examples would return:

**Syntax**: =IMSUM(A3,B3)**Result**: 4+3i

**Syntax**: =IMSUM(A4,B4)**Result**: 15+3i

**Syntax**: =IMSUM(A5,B5)**Result**: 2i

**Syntax**: =IMSUM(A6,B6)**Result**: 15+2i

**Syntax**: =IMSUM(A7,B7)**Result**: 10+240i

**Syntax**: =IMSUM(A8,B8)**Result**: 18+7i

**Syntax**: =IMSUM(A9,B9,C9)**Result**: 17+2i

**Syntax**: =IMSUM(A10,B10,C10)**Result**: 14-10i

**Syntax**: =IMSUM(A11,B11,C11)**Result**: 10-8i

**Syntax**: =IMSUM(A12,B12,C12)

**Result**: 113-35j

**Syntax**: =IMSUM(A13,B13,C13)**Result**: 248+269i

**Note**:

- The formula returns the #NUM! error if the complex number doesn’t have lower case i or j (iota).
- The formula returns the #VALUE! Error if the complex number doesn’t have correct complex number format.