Jawabanmu

2014-05-06T07:02:50+07:00
F(k) = -12
-2k+6 =-12
-2k = -18
k = 9  E
2014-05-06T07:20:02+07:00
Mnurut Q JWBNnya
f(x) =-2x +6
f(k)=-12
Nilai K =
  f(k)=-2(k) +6 =-12
        -2k +6 =-12
             -2k = -12-6 
             -2k =-18
               k= -18 :2
               k=-9