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  • https://eng.libretexts.org/Under_Construction/Book%3A_The_Joy_of_Cryptography_(Rosulek)/04%3A_Secret_Sharing/4.03%3A_Polynomial_Interpolation
    \[\begin{aligned} &\ell_{1}(\boldsymbol{x})=\frac{\left(\boldsymbol{x}-x_{2}\right)\left(\boldsymbol{x}-x_{3}\right)\left(\boldsymbol{x}-x_{4}\right)}{\left(x_{1}-x_{2}\right)\left(x_{1}-x_{3}\right)\...\[\begin{aligned} &\ell_{1}(\boldsymbol{x})=\frac{\left(\boldsymbol{x}-x_{2}\right)\left(\boldsymbol{x}-x_{3}\right)\left(\boldsymbol{x}-x_{4}\right)}{\left(x_{1}-x_{2}\right)\left(x_{1}-x_{3}\right)\left(x_{1}-x_{4}\right)}=\frac{(\boldsymbol{x}-4)(\boldsymbol{x}-5)(\boldsymbol{x}-2)}{(3-4)(3-5)(3-2)}=\frac{\boldsymbol{x}^{3}-11 \boldsymbol{x}^{2}+38 \boldsymbol{x}-40}{2} \\ &\ell_{2}(\boldsymbol{x})=\frac{\left(\boldsymbol{x}-x_{1}\right)\left(\boldsymbol{x}-x_{3}\right)\left(\boldsymbol{x}-x…

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