Determine the coefficients of a polynomial of third degree that best fit the

points:

I found this polynomial:Code:X | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Y | -12 | -11 | -9 | -2 | 2 | 6 | 9 | 11 | 12 |

$\displaystyle P(x) = 0 -97,6x + 40,471x^2 -3,65x^3$

Are correct ?