Here's the first one.
. . Your punchlines are a bit off . . .
The left side: .
We have: .
There are two cases:  both factors are positive,  both factors are negative.
The right side: .
There are two cases:  the factors are (-)(+),  the factors are (+)(-).
To determine the final solution, I had to make pretty pictures . . .
x < 1 or x > 4
= = = = o - - - - - o = = = =
-1 < x < 5
- - o = = = = = = = = = = = o - -
Combining them, we have:
- - o = = o - - - - - o = = o - -
-1 1 4 5