please di jawa ya :) jika fungsi g : x -> 1/4 (x - 3) tentukan nilai a jika g(a) = 9

g(x) = 1/4 (x - 3)
g(a) = 1/4 (a - 3)
g (a) = 9, maka:
9 = 1/4 (a - 3)
9 x 4 = a - 3
36 = a - 3
a = 36 + 3 = 39

g(x) : 1/4 (x-3)
g(a) : 1/4 (a-3) = 9
       : 1/4 a - 3/4 = 9
       : 1/4 a = 9 3/4
       : a = 9,75 : 0,25
       : a =  39

bukti =
g(39) = 1/4 (39-3)
         = 9,75 - 0,75
          = 9