Using the definition of the Vertical shifts of graphs of the function : 
"Suppose c>0, 
 To graph y=f(x)+c, shift the graph of y=f(x) upward c units. 
 To graph y=f(x)-c, shift the graph of y=f(x) downward c units" 
Again we recall the definition of Horizontal shifts of graphs: 
" suppose c>0, 
 the graph y=f(x-c), shift the graph of y=f(x) to the right by c units
 the graph y=f(x+c), shift the graph of y=f(x) to the left by c units. "
consider  is the parent function.
 is the parent function. 
 shifts the graph
 shifts the graph  upward by 8 units
 upward by 8 units
 shifts the graph
 shifts the graph  downward by 8 units
downward by 8 units
 shifts the graph
 shifts the graph  left by 8 units
 left by 8 units
 shifts the graph
 shifts the graph  right by 8 units.
 right by 8 units.