\[8x - 2x^{2} + 3 = 0\]
\[4x - x^{2} + 1,5 = 0\]
\[x^{2} - 4x - 1,5 = 0\]
\[x_{1} + x_{2} = 4\]
\[x_{1} \cdot x_{2} = - 1,5.\]