# JavaScript Math.expm1()

The `Math.expm1()` method returns e (Euler's constant) raised to the given power minus 1. It is equivalent to ex - 1 in mathematics.

### Example

``````// calculate e (Euler's constant)
// raised to the power of 2
// and then subtracted by 1
var value = Math.expm1(2);

console.log(value);

// Output : 6.38905609893065  ``````

## expm1() Syntax

The syntax of the `expm1()` method is:

``Math.expm1(x)``

Here, `expm1()` is a static method. Hence, we need to access the method using the class name, `Math`.

## expm1() Parameters

The `expm1()` method takes in:

• x - A number

## expm1() Return Value

The `expm1()` method returns:

• ex - 1 for argument x, where e is Euler's constant (2.71828).
• `NaN` for non-numeric arguments.

## Example 1: JavaScript Math.expm1()

``````// calculate e raised to the power of 1 minus 1
var value1 = Math.expm1(1);

console.log(value1);

// calculate e raised to the power of 2 minus 1
var value2 = Math.expm1(2);

console.log(value2);

// calculate e raised to the power of 5 minus 1
var value3 = Math.expm1(5);

console.log(value3); ``````

Output

```1.718281828459045
6.38905609893065
147.4131591025766```

In the above example,

1. `Math.expm1(1)` - computes e1 - 1
2. `Math.expm1(2)` - computes e2 - 1
3. `Math.expm1(5)` - computes e5 - 1

## Example 2: expm1() With 0

``````// calculate e raised to the power of 0 minus 1
var value = Math.expm1(0);

console.log(value);

// Output: 0``````

In the above example, we have used the `expm1()` method to compute the e (Euler's constant) raised to the power of 0 and then subtracted by 1 i.e. e0 - 1.

The output `0` indicates the following mathematical result:

`e0 - 1 = 0`

## Example 3: expm1() With Negative Numbers

``````// calculate e raised to the power of -1 minus 1
var value = Math.expm1(-1);

console.log(value);

// Output: -0.6321205588285577``````

In the above example, we have used the `expm1()` method to compute the e (Euler's constant) raised to the power of -1 minus 1 i.e. e-1 - 1.

The output `-0.6321205588285577` indicates that e-1 - 1 is a negative number. This is because `e-1` is 0.36787944117144233, and subtracting 1 from it makes it negative.