\[x^{2}(x + 4) - (x - 2)\left( x^{2} + 1 \right) = 3\]
\[x^{3} + 4x^{2} - x^{3} + 2x^{2} - x + 2 - 3 = 0\]
\[6x^{2} - x - 1 = 0\]
\[Вторая\ степень.\]