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# [Python 3], 46 bytes

```python
lambda a,x:sum(c*x**i for i,c in enumerate(a))
```

[Try it online!][TIO-kttislvf]

[Python 3]: https://docs.python.org/3/
[TIO-kttislvf]: https://tio.run/##VY1LDoMgEEDXcorZCYYSv0ljYi9iXVCLKU1BA5jY01NQN13MYt6bzFu@7jXryk/d3X@4ejw5cLq1dlV4zLYskzDNBiQdQWoQelXCcCcwJ8Q7YZ2FDnqU4L5g@UChuJaEnistd1QfoGTNCXLW/N3QKkwdVREMGhCKxfg8JvdIi5LFSO1wSiFl71lqrPiCrTM0ekICvtyCnHB2AP8D "Python 3 – Try It Online"