Solve [4X]+10=26 .
[4X]+10=26 --- subtract 10 from each side.
[4X] = 16 ------- divide both sides by 4.
[X] = 4
Now, the square brackets, [ ], are the absolute function, which means that they take the absolute, or positive, value of whatever is inside them.
Since X can be either positive or negative, and [X] is always positive, then
The two solutions are: X = 4, X = -4