Question

Question attached in a file.

The answer is 'x', but I'm not sure how one would come to that solution.

Answer 1

Thanks much! :)

Answer 2

suppose \(x\) was \(5\) then \(\#5=-5+1=-4\) and
\[\#-4=-(-4)+1=4+1=5\]
now try it with \(x\) instead of \(5\)

Answer 3

Okay.

So, x = x, and therefore, #x = -x + 1 = -x + 1 ..
#(-x+1) = -(-x+1) + 1 = x -1 +1 = x

Oh. Makes sense. I was a bit confused why you put #-4, but I guess it was supposed to be #(-4)? Okay.
Thanks much!