Решите срочно y=|x|(x-2)-4x

Рассмотрим два случая:
$\left \{ {{x \geq 0} \atop {y=x(x-2)-4x}} \right. \left \{ {{x\ \textless \ 0} \atop {y=-x(x-2)-4x}} \right. \\ \left \{ {{x \geq 0} \atop {y=x^2-2x-4x}} \right. \left \{ {{x\ \textless \ 0} \atop {y=-x^2+2x-4x}} \right. \\ \left \{ {{x \geq 0} \atop {y=x^2-6x+9-9}} \right. \left \{ {{x\ \textless \ 0} \atop {y=-x^2-2x-1+1}} \right. \\ \left \{ {{x \geq 0} \atop {y=(x-3)^2-9}} \right. \left \{ {{x\ \textless \ 0} \atop {y=-(x+1)^2+1}} \right.$