I have this formula calculated by excel:
$$y = -0.0001x^3 + 0.0294x^2 - 0.0567x - 68$$

This formula was calculated using this data:

```
Data1      Data2
0           -68
50          -11
75           47
100         111

```

What I need to way to calculate the same 3rd degree polynomial, but using this data.

```
Data1      Data2
a           -68
b           -11
c            47
d           111

```

I appreciate any tips or links that would help me to solve this.

Thanks in advance