Math Forum - Ask Dr. Math
....googling does wonders...
Hey guys, just wondering how you would go about determining f^(-1) (x) of the function,
f(x) = x + |x|/2
What I did first was that I let f(x) = y. Then, I switched the x and the y variables
y = x + |x|/2
x = y + |y|/2
I don't know how to isolate for y since part of it is in absolute notation. Help?