(x+7)(x+1)>0 x1=-7 x2=-1
------------------------- -7----------------------- -1--------------------
+ - +
x∈(∞;-7)∪(-1;∞)
x-8
----- >0 ------------------ 1----------------------8-----------------------
x-1 + - +
x∈(-∞;1)∪(8;∞)
x³-256x<0 x(x²-256)<0 x(x-16)(x+16)<0<br>----------- -16------------- 0---------------- 16---------------
- + - +
x∈(-∞;-16)(0;16)