[tex] {x}^{2} + 6x + 8 = 0 \\ x1 + x2 = - 6 \\ x1 \times x2 = 8 \\ x1 = - 4 \\ x2 = - 2[/tex]

[tex] {18x}^{4} y - 27x = 9x(2 {x}^{3} y - 3)[/tex]

б - 9x