Jawabanmu

2014-04-10T18:55:36+07:00
Insyaallah bnr 
f(x), f 'x = 0 
f 'x = (4x+9) √x" + 7
      = (4(-3) + 9) √(-3)" + 7
      = -4 + 4
       = 0
@sucitadwiranti bisa tolong bantuin lagi ndak??