In middle school, we have learned the concept of absolute value , operations on real numbers , absolute value functions , absolute value triangle inequality , etc. For the convenience of application, a brief summary is given below.
Absolute value function
Assume , defined by absolute value , the absolute value function can be transformed into a piecewise function
or
,
Its segmentation point is . Obviously, its domain
,
the value range , the graph of this function is shown in the figure below.
