Verified answer

(4-3x)(x+2)=12-x*(3x-8)

8-2x-3x²=12-3x²+8x

10x=-4

x=-0,4.

Ответ: x=-0,4.

x³+4x²-x-4=x²*(x+4)-(x+4)=(x+4)*(x²-1)=(x+4)*(x+1)*(x-1).