(х-4)(3х+1)(х+1) > 0
x-4=0; х=4
3х+1=0; 3х=-1; х=-1/3
х+1=0; х=-1
- + - +
-------₀-------₀------------₀-------->x
-1 -1/3 4
х∈(-1; -1/3)∪(4; ∞)
х³-64х > 0
x(x²-64) > 0
x(x-8)(x+8) > 0
х=0
х-8=0; х=8
х+8=0; х=-8
- + - +
--------₀-----------₀----------₀------->х
-8 0 8
х∈(-8; 0)∪(8; ∞)