# LCM / polynomial LCM Calculator: Calculate the least common multiple of integers and polynomials

You can calculate the LCM (Least common multiple) of integers or polynomials by inputting the command `lcm`

and integers in the form like this.

```
lcm 4 6
```

The LCM of (4, 6) is 12 and here is the output screen.

12 is a multiple of 4 because 12 = 4 × 3 and 12 is a multiple of 6 because 12 = 6 × 2. The number is called the "common multiple" of 4 and 6 if it is the multiple of both 4 and 6. So 12 is the common multiple of 4 and 6. 12, 24, 36, 48, 60 are all the common multiples. 12 is the least of them so 12 is the "least common multiple", that is LCM of 4 and 6.

It's possible to calculate the LCM of three numbers such as (4, 6, 9).

```
lcm 4 6 9
```

If you input 4, 6, 9 after `lcm`

, the calculator shows 36 as output.

All numbers must be separated by a comma or space. So `lcm 4 6`

and `lcm 4, 6`

are valid.

## Polynomial LCM

You can calculate the polynomial LCM of polynomials by `lcm`

.

```
lcm x-1, 2*x+3
```

The above input means calculating the polynomial LCM of x-1 and 2x+3. The output is

\[ 2 x^{2} + x - 3 \]

Note that the calculator can't recognize the implicit multiplication like `2x`

, `3x`

and an asterisk is needed to express it. To calculate the polynomial LCM, polynomials input in the form should be separated by comma. The below won't work because they are separated by space.

```
lcm x-1 x-2
```

## Auto simplification

The next example works.

```
lcm x-1, x+sin(pi/2)
```

Output:

\[ x^{2} - 1 \]

`sin(pi/2)`

is 1 and the second polynomial is equal to x+1. The calculator simplifies all polynomials before producing the LCM of polynomials.