# Complex.Multiply Method (Complex, Complex)

.NET Framework (current version)

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Returns the product of two complex numbers.

Namespace:   System.Numerics
Assembly:  System.Numerics (in System.Numerics.dll)

## Syntax

```public static Complex Multiply(
Complex left,
Complex right
)
```

#### Parameters

left
Type: System.Numerics.Complex

The first complex number to multiply.

right
Type: System.Numerics.Complex

The second complex number to multiply.

#### Return Value

Type: System.Numerics.Complex

The product of the left and right parameters.

## Remarks

The multiplication of a complex number, a + bi, and a second complex number, c + di, takes the following form:

(ac - bd) + (ad + bc)i

If the multiplication results in an overflow in either the real or imaginary component, the value of that component is either Double.PositiveInfinity or Double.NegativeInfinity.

The Multiply method is implemented for languages that do not support custom operators. Its behavior is identical to multiplication using the multiplication operator.

## Examples

The following example multiples a complex number by each element in an array of complex numbers.

```using System;
using System.Numerics;

public class Example
{
public static void Main()
{
Complex number1 = new Complex(8.3, 17.5);
Complex[] numbers = { new Complex(1.4, 6.3),
new Complex(-2.7, 1.8),
new Complex(3.1, -2.1) };
foreach (Complex number2 in numbers)
Console.WriteLine("{0} x {1} = {2}", number1, number2,
Complex.Multiply(number1, number2));
}
}
// The example displays the following output:
//       (8.3, 17.5) x (1.4, 6.3) = (-98.63, 76.79)
//       (8.3, 17.5) x (-2.7, 1.8) = (-53.91, -32.31)
//       (8.3, 17.5) x (3.1, -2.1) = (62.48, 36.82)
```

## Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone
Available since 8.1