GRE test prep... 'function question'

Hello out there… here’s two ‘function’ questions to solve. Any takers:)?
1.
*x= x/2 + x - 4

y= *12

*y= ?

  1. *x= x squared + 4 (sorry don’t know how to superscript in this format)

(2)* = ?

I am grateful for any assistance.

in q1 *12 = 12/2 + 12 -4= 14, so y=14. then just do the same thing wiht y as you did with 12. go to gmatgremath.blogspot.com the gre tutor there has more detaied expalantions