\begin{equation} \vec{B}(t) = \sum_{i=0}^{n} \frac{n!}{i!(n-1)!} (1-t)^{n-i} t^i \vec{P}_i \\ \end{equation}
\begin{equation} y = a_0 + a_1 x + a_2 x^2 + a_3 x^3 \\ \end{equation}