Step 1:
Write the parent function
[tex]f(x)\text{ = |x - 1| - |x + 1|}[/tex]
Step 2:
To find f(-a), substitute x = -a
[tex]\begin{gathered} f(x)\text{ = |x - 1| - | x + a|} \\ \text{Absolute function of x is represented by |x| and absolute value} \\ of\text{ -x is |-x| = |x|} \end{gathered}[/tex][tex]\begin{gathered} \text{Therefore} \\ f(-a)\text{ = | -a - 1| - |-a + 1|} \\ f(-a)\text{ = |-(a+1)| - |-(a - 1)|} \\ f(-a)=\text{ |a + 1| - | a - 1|} \end{gathered}[/tex]
Step 3:
[tex]\begin{gathered} f(x\text{) = |x - 1| - |x + 1|} \\ f(a\text{ + h) = |a + h -1| - |a + h + 1| } \end{gathered}[/tex]