TeX source:
\begin{array}{rclll} f\left(-\dfrac{1}{3}\right) &=& 2 \cdot \left(-\dfrac{1}{3}\right)^4-\left(-\dfrac{1}{3}\right)^3+3 \cdot \left(-\dfrac{1}{3}\right)^2+13 &=& \dfrac{1.085}{81} \approx 13{,}40 \quad \rightarrow \quad P_1\left(-\dfrac{1}{3} \mid \dfrac{1.085}{81} \right) \end{array}