# Python | Numpy np.polyfromroots() method

`np.polyfromroots()` method is used to generate a polynomial series with given roots.

Syntax : `np.polyfromroots(roots)`
Parameters:
roots :[array_like] Input sequence containing the roots.

Return : [ndarray] 1-D array of coefficients of polynomial series.

Code #1 :

 `# Python program explaining ` `# numpy.polyfromroots() method  ` `   `  `# importing numpy as np   ` `# and numpy.polynomial.polynomial module as geek  ` `import` `numpy as np  ` `import` `numpy.polynomial.polynomial as geek ` `   `  `# Input roots ` ` `  `roots ``=` `(``2``, ``4``, ``8``)  ` `    `  `# using np.polyfromroots() method  ` `res ``=` `geek.polyfromroots(roots)  ` ` `  `# Resulting polynomial series coefficient ` `print` `(res)  `

Output:

```[-64.  56. -14.   1.]
```

Code #2 :

 `# Python program explaining ` `# numpy.polyfromroots() method  ` `   `  `# importing numpy as np   ` `# and numpy.polynomial.polynomial module as geek  ` `import` `numpy as np  ` `import` `numpy.polynomial.polynomial as geek ` `   `  `# Input roots ` `s ``=` `(``1``, ``2``, ``3``, ``4``, ``5``)  ` ` `  `   `  `# using np.polyfromroots() method  ` `res ``=` `geek.polyfromroots(s)  ` ` `  `# Resulting polynomial series coefficient ` `print` `(res)  `

Output:

```[-120.  274. -225.   85.  -15.    1.]

```

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