I have some sample data, I draw a trending line which gives me equation as well. But I found that the trending line sometimes isn't trustworthy at all.

**The trending line graph doesn't match the equation!**

I think that's unacceptable and totally out of my expectation. Why is it?

Sample data:

```
count(x) runtime(y)
1000 0.1
2000 0.8
4000 6.4
8000 51.1
```

How to reproduce it: Draw a scatter plot, add a trending line, choose Exponential. Then try to calculate by the given equation, when `x`

= `4000`

, `7000`

, `8000`

. And you can see `y`

doesn't match the graph at all.

fileLink: https://anonfile.com/A4m0F7lbb3/sheet1_-_copy_xlsx

Screenshot: